Fix build with gfortran 10.

Taken from Debian:
https://salsa.debian.org/science-team/atlas/-/blob/master/debian/patches/gfortran-10.patch

--- a/interfaces/blas/C/testing/c_dblat1.f
+++ b/interfaces/blas/C/testing/c_dblat1.f
@@ -247,11 +247,11 @@
             IF (ICASE.EQ.7) THEN
 *              .. DNRM2TEST ..
                STEMP(1) = DTRUE1(NP1)
-               CALL STEST1(DNRM2TEST(N,SX,INCX),STEMP,STEMP,SFAC)
+               CALL STEST1(DNRM2TEST(N,SX,INCX),STEMP(1),STEMP,SFAC)
             ELSE IF (ICASE.EQ.8) THEN
 *              .. DASUMTEST ..
                STEMP(1) = DTRUE3(NP1)
-               CALL STEST1(DASUMTEST(N,SX,INCX),STEMP,STEMP,SFAC)
+               CALL STEST1(DASUMTEST(N,SX,INCX),STEMP(1),STEMP,SFAC)
             ELSE IF (ICASE.EQ.9) THEN
 *              .. DSCALTEST ..
                CALL DSCALTEST(N,SA((INCX-1)*5+NP1),SX,INCX)
--- a/interfaces/blas/C/testing/c_sblat1.f
+++ b/interfaces/blas/C/testing/c_sblat1.f
@@ -247,11 +247,11 @@
             IF (ICASE.EQ.7) THEN
 *              .. SNRM2TEST ..
                STEMP(1) = DTRUE1(NP1)
-               CALL STEST1(SNRM2TEST(N,SX,INCX),STEMP,STEMP,SFAC)
+               CALL STEST1(SNRM2TEST(N,SX,INCX),STEMP(1),STEMP,SFAC)
             ELSE IF (ICASE.EQ.8) THEN
 *              .. SASUMTEST ..
                STEMP(1) = DTRUE3(NP1)
-               CALL STEST1(SASUMTEST(N,SX,INCX),STEMP,STEMP,SFAC)
+               CALL STEST1(SASUMTEST(N,SX,INCX),STEMP(1),STEMP,SFAC)
             ELSE IF (ICASE.EQ.9) THEN
 *              .. SSCALTEST ..
                CALL SSCALTEST(N,SA((INCX-1)*5+NP1),SX,INCX)
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<div class='path'>path: <a href='/guix/log/?id=cfd83f3282ed1c416e0e99bdfc334d9be0d1856b'>root</a>/<a href='/guix/log/.gitignore?id=cfd83f3282ed1c416e0e99bdfc334d9be0d1856b'>.gitignore</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/.gitignore?id=cfd83f3282ed1c416e0e99bdfc334d9be0d1856b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-09-24 10:11:38 +0200'>2019-09-24</span></td><td><a href='/guix/commit/.gitignore?id=11da634a6e64afa2904542e2174aa2a185f9ac3a'>Merge branch 'master' into core-updates</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-18 11:38:14 +0200'>2019-09-18</span></td><td><a href='/guix/commit/.gitignore?id=7bc46ecc34ceb042ff890e5d306d0a2a736e891d'>doc: Add Guix Cookbook.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-06-14 22:09:38 +0200'>2019-06-14</span></td><td><a href='/guix/commit/.gitignore?id=92d00ca4661e186022732a47956a2bc0ef16be96'>build: Remove 'gnu/packages/bootstrap' and its binaries.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-26 11:21:32 +0200'>2019-04-26</span></td><td><a href='/guix/commit/.gitignore?id=9ca5ff882e2ac4eaab02eb0fde545bd784af478b'>bootstrap: Break automake dependency on generated files.</a><span class='msg-avail'>...</span></td><td>Miguel Ángel Arruga Vivas</td></tr>
<tr><td><span title='2018-11-20 01:42:43 +0100'>2018-11-20</span></td><td><a href='/guix/commit/.gitignore?id=975b7966f592993bce04e3c153f52f2ece402f21'>.gitignore: Re-add 'authenticate' script.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-06-14 11:17:00 +0200'>2018-06-14</span></td><td><a href='/guix/commit/.gitignore?id=ea0a06cee2ba05451f94714a4f913db02efbe92c'>Remove 'guix-register' and its traces.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-06-12 15:23:34 +0200'>2018-06-12</span></td><td><a href='/guix/commit/.gitignore?id=5909bdc88735c2c1bd9f44eb6a1b518785144292'>.gitignore: Add doc/stamp-[0-9].</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-04-19 21:30:30 +0200'>2018-04-19</span></td><td><a href='/guix/commit/.gitignore?id=b9fe8fd662180e64156d2b95a671242c20f0acfc'>gnu: doc: Allow documentation to be translated.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-02-13 22:56:49 +0200'>2018-02-13</span></td><td><a href='/guix/commit/.gitignore?id=99f696324271992eb78874f1b697102db6968625'>.gitignore: Add guix-daemon SELinux policy.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-05-13 12:14:28 +0300'>2017-05-13</span></td><td><a href='/guix/commit/.gitignore?id=498abb3ed1d7dcda3ffac15832eb1e25d08e9162'>.gitignore: Ignore Emacs auto-save files.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2017-05-08 20:08:23 +0200'>2017-05-08</span></td><td><a href='/guix/commit/.gitignore?id=65584b91c7029e93e6fd207f08c958206f1dcfc5'>build: Add doc/guix.html to .gitignore.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2017-05-04 23:51:45 +0200'>2017-05-04</span></td><td><a href='/guix/commit/.gitignore?id=e6860b5e7f8ded96c1769dcff27dffb97587e3e2'>build: Use Gnulib's 'git-version-gen'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-02-27 16:44:58 +0300'>2017-02-27</span></td><td><a href='/guix/commit/.gitignore?id=1162418ee88f155f6b14fd8926479c2176e40e76'>.gitignore: Remove stale entries.</a><span class='msg-avail'>...</span></td><td>Alex Kost</td></tr>
<tr><td><span title='2017-02-10 13:39:02 +0100'>2017-02-10</span></td><td><a href='/guix/commit/.gitignore?id=01ceca26589ff7a08d5045c98c7f4174527684cc'>build: Add build-aux/ar-lib to .gitignore.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2017-01-13 18:49:31 +0100'>2017-01-13</span></td><td><a href='/guix/commit/.gitignore?id=557d9c8d7a843bf06e75b4e1a742654ccf951fa3'>etc: Support indentation of whole files.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-01-12 14:56:52 +0100'>2017-01-12</span></td><td><a href='/guix/commit/.gitignore?id=7bb2b10cd01a076d7d5e964ed433e62846042859'>etc: Add 'indent-package.el' script.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-11-24 09:23:11 +0100'>2016-11-24</span></td><td><a href='/guix/commit/.gitignore?id=332d7903f52c2bf3741b04ac2d01cd9018b70800'>Add system start-up files for "guix publish".</a><span class='msg-avail'>...</span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2016-11-16 18:19:47 +0100'>2016-11-16</span></td><td><a href='/guix/commit/.gitignore?id=94d92c7796a3dd50c27d532315f7d497ac99f08e'>daemon: Add "builtin:download" derivation builder.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>