PR30806, CPPFLAGS are missing for bfd/chew, syslex_wrap and sysinfo

	PR 30806
bfd/
	* doc/local.mk (doc/chew.stamp): Add CPPFLAGS_FOR_BUILD.
	* Makefile.in: Regenerate.
binutils/
	* Makefile.am (syslex_wrap.@OBJEXT@): Add CPPFLAGS_FOR_BUILD.
	(sysinfo.@OBJEXT@): Likewise.
	* Makefile.in: Regenerate.