* config/sol2.h, config/alpha/alpha.h, config/alpha/linux.h,
	config/i386/i386-interix.h, config/ia64/hpux.h, config/mips/iris6.h,
	config/mips/linux.h, config/mips/mips.h, config/pa/pa-hpux.h,
	config/pa/pa-hpux10.h, config/pa/pa-hpux11.h, config/pa/pa-pro-end.h,
	config/pa/pa.h, config/pa/rtems.h: Use c_dialect_ macros.

From-SVN: r68763