Since commit e1542427 the flag -many is
sometimes not passed to the assembler.  Use .machine ppc to prevent
errors if these files are assembled for an ISA which does not support
FPRs.

libgcc/

	* config/rs6000/crtresfpr.S: Use .machine ppc.
	* config/rs6000/crtresxfpr.S: Likewise.
	* config/rs6000/crtsavfpr.S: Likewise.