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=d4c466b7543db038e4ff0c21d856b2085cb78ef5'>root</a>/<a href='/guix/log/nix?id=d4c466b7543db038e4ff0c21d856b2085cb78ef5'>nix</a>/<a href='/guix/log/nix/libstore?id=d4c466b7543db038e4ff0c21d856b2085cb78ef5'>libstore</a>/<a href='/guix/log/nix/libstore/misc.hh?id=d4c466b7543db038e4ff0c21d856b2085cb78ef5'>misc.hh</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/nix/libstore/misc.hh?id=d4c466b7543db038e4ff0c21d856b2085cb78ef5&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-03-30 23:42:07 +0200'>2018-03-30</span></td><td><a href='/guix/commit/nix/libstore/misc.hh?id=c7589cce8d3f9fcb7769e424f341dba8fb3545d0'>daemon: Remove dead code.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/libstore/globals.cc (Settings::loadConfFile, Settings::unpack):
Remove.
* nix/libstore/globals.hh: Adjust accordingly.
* nix/libstore/misc.cc (queryMissing): Remove.
* nix/libstore/misc.hh: Adjust accordingly.
* nix/libstore/store-api.cc (followLinksToStore)
(followLinksToStorePath, computeStorePathForHash): Remove.
* nix/libstore/store-api.hh: Adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>