* i386/uwin.h (MD_STARTFILE_PREFIX): Avoid redefinition warnings.
	* interix.h (TARGET_MEM_FUNCTIONS): Likewise.
	* psos.h (CPP_PREDEFINES): Likewise.
	* rs6000/linux64.h (ROUND_TYPE_ALIGN): Likewise.
	* rs6000/xcoff.h (RS6000_MCOUNT, RS6000_ITRUNC, RS6000_UITRUNC,
	ASM_OUTPUT_EXTERNAL): Likewise.
	* sparc/liteelf.h (DWARF_DEBUGGING_INFO, DWARF2_DEBUGGING_INFO):
	Likewise.
	* sparc/sp64-elf.h (UNALIGNED_DOUBLE_INT_ASM_OP): Likewise.
	* sparc/sp86x-elf.h (DWARF_DEBUGGING_INFO, DWARF2_DEBUGGING_INFO):
	Likewise.
	* sparc/sunos4.h (SUNOS4_SHARED_LIBRARIES): Likewise.

From-SVN: r48070