[PATCH] Raise the minimum GCC version to GCC 7.1 [BZ #32414]

[H.J. Lu]

commit 776938e8b8dcf2b59998979e91cc0f9db7d771a8
Author: Joseph Myers <josmyers@redhat.com>
Date:   Wed Dec 4 20:04:04 2024 +0000

    Implement C23 sinpi

doesn't build with GCC 6:
...
./s_cospi_template.c: In function ‘__cospif128’:
./s_cospi_template.c:29:27: error: invalid suffix "f128" on floating constant
   x = M_FABS (x - M_MLIT (2.0) * M_SUF (round) (M_LIT (0.5) * x));
                           ^
../sysdeps/generic/math-type-macros-float128.h:31:19: note: in
definition of macro ‘M_MLIT’
 #define M_MLIT(c) c ## f128
                   ^

Also tst-strtod5.c and tst-strtod5i.c can't build with GCC 6.  Raise the
minimum GCC version to GCC 7.1.  This fixes BZ #32414.

-- 
H.J.
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