crtfastmath.c: Include <signal.h>, <ucontext.h>.

crtfastmath.c: Include <signal.h>, <ucontext.h>.

	gcc:
	* config/i386/crtfastmath.c [!__x86_64__ && __sun__ && __svr4__]:
	Include <signal.h>, <ucontext.h>.
	(sigill_caught): Define.
	(sigill_hdlr): New function.
	(set_fast_math) [!__x86_64__ && __sun__ && __svr4__]: Check if SSE
	insns can be executed.
	* config/sol2.h (ENDFILE_SPEC): Use crtfastmath.o if -ffast-math
	etc.
	* config/sparc/sol2.h (ENDFILE_SPEC): Remove.

	libgcc:
	* config.host (i[34567]86-*-solaris2*): Add i386/t-crtfm to
	tmake_file.
	Add crtfastmath.o to extra_parts.

From-SVN: r174532