* libc/include/machine/setjmp.h [__mips__]: Remove __mips_fpr == 64
	from the 64-bit _JBTYPE definition.
	* libc/machine/mips/setjmp.S: Re-work the o32 FP64 support to match
	the now one-and-only supported o32 FP64 ABI extension.  Also
	support o32 FPXX.
	* mips/crt0.S: Configure processor based on .MIPS.abiflags.
	Remove FPU availability check, just use the pre-processor flags
	to indicicate what the user wanted.
	* mips/abiflags.S: New file.
	* mips/regs.S (SR_MSA): Define macro.
	* mips/mti32.ld: Place .MIPS.abiflags and wrap in marker symbols.
	* mips/mti64.ld: Likewise.
	* mips/mti64_64.ld: Likewise.
	* mips/mti64_n32.ld: Likewise.