* configure.ac: Check for floatingpoint.h, fptrap.h and float.h
	headers. Use LIBGFOR_CHECK_FPSETMASK. Check for fp_trap and
	fp_enable functions.
	* configure.host: Add case for systems with fpsetmask and systems
	with fp_trap/fp_enable.
	* config/fpu-sysv.h: New file, FPU code using fpsetmask.
	* config/fpu-aix.h: New file, FPU code for AIX using fp_trap and
	fp_enable.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* config.h.in: Regenerate.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@105956 138bc75d-0d04-0410-961f-82ee72b054a4