PR preprocessor/12847

	* cppfiles.c, cppexp.c, cpperror.c, cpplib.h, cpplib.c, cpplex.c,
	cppinit.c, cpptrad.c, cppmacro.c, fix-header.c, cpppch.c, c-pch.c,
	c-incpath.c, cppcharset.c (DL_WARNING, DL_WARNING_SYSHDR, DL_PEDWARN,
	DL_ERROR, DL_ICE, DL_EXTRACT, DL_WARNING_P): Prefix macro names with
	"CPP_".


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@73183 138bc75d-0d04-0410-961f-82ee72b054a4