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/commit/?id=478e75b53bdf754cdf911226d37e517387f73c09'>root</a>/<a href='/guix/commit/emacs?id=478e75b53bdf754cdf911226d37e517387f73c09'>emacs</a>/<a href='/guix/commit/emacs/guix-command.el?id=478e75b53bdf754cdf911226d37e517387f73c09'>guix-command.el</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='478e75b53bdf754cdf911226d37e517387f73c09'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Leo Famulari &lt;leo@famulari.name&gt;</td><td class='right'>2016-05-05 16:29:20 -0400</td></tr>
<tr><th>committer</th><td>Leo Famulari &lt;leo@famulari.name&gt;</td><td class='right'>2016-05-05 16:30:10 -0400</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/guix/commit/emacs/guix-command.el?id=478e75b53bdf754cdf911226d37e517387f73c09'>478e75b53bdf754cdf911226d37e517387f73c09</a> (<a href='/guix/patch/emacs/guix-command.el?id=478e75b53bdf754cdf911226d37e517387f73c09'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/guix/tree/?id=478e75b53bdf754cdf911226d37e517387f73c09'>812d99a11300bf20472cb1be954c4b9db00c6ca5</a> /<a href='/guix/tree/emacs/guix-command.el?id=478e75b53bdf754cdf911226d37e517387f73c09'>emacs/guix-command.el</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/guix/commit/emacs/guix-command.el?id=d46123aade7bc5226004eb46ee1084dc84f2b30a'>d46123aade7bc5226004eb46ee1084dc84f2b30a</a> (<a href='/guix/diff/emacs/guix-command.el?id=478e75b53bdf754cdf911226d37e517387f73c09&amp;id2=d46123aade7bc5226004eb46ee1084dc84f2b30a'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='oid'><a href='/guix/snapshot/guix-478e75b53bdf754cdf911226d37e517387f73c09.tar.gz'>guix-478e75b53bdf754cdf911226d37e517387f73c09.tar.gz</a><br/><a href='/guix/snapshot/guix-478e75b53bdf754cdf911226d37e517387f73c09.zip'>guix-478e75b53bdf754cdf911226d37e517387f73c09.zip</a><br/></td></tr></table>
<div class='commit-subject'>gnu: wrap-python3: Create more symlinks.</div><div class='commit-msg'>Suggested by Hartmut Goebel &lt;h.goebel@crazy-compilers.com&gt;.

* gnu/packages/python.scm (wrap-python3): Add symlinks for 'pip' and
'python-config'.
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