config.gcc (mips*-*-*): Add --with-fpu support.

config.gcc (mips*-*-*): Add --with-fpu support.

gcc/
2013-07-26  Jürgen Urban  <JuergenUrban@gmx.de>

	* config.gcc (mips*-*-*): Add --with-fpu support.  Make single the
	default for R5900 targets.
	* config/mips/mips.h (OPTION_DEFAULT_SPECS): Handle --with-fpu.
	(ISA_HAS_LDC1_SDC1): Set to false for TARGET_MIPS5900.
	* config/mips/mips.c (mips_option_override): Report an error for
	-march=r5900 -mhard-float -mdouble-float.  Use spu_single_format
	for -march=r5900 -mhard-float.

From-SVN: r201143