PR fortran/31832
* acinclude.m4 (LIBGFOR_CHECK_FOR_BROKEN_POWF): New autoconf check for
broken powf.
* configure.ac (LIBGFOR_CHECK_FOR_BROKEN_POWF): Use it.
* intrinsics/c99_functions.c: Use internal powf implementation if
HAVE_BROKEN_POWF is defined.
* configure: Rebuilt.
* config.h.in: Rebuilt.
From-SVN: r142952