* configure.ac: Check for ieeefp.h. Check for fabsf in libm.
* configure: Regenerate.
* config.h.in: Likewise.
* c99_protos.h: New file.
* libgfortran.h: Include c99_protos.h and conditionally ieeefp.h.
* intrinsics/c99_functions.c (fabsf): New function.
From-SVN: r91832