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)