* cpphash.h (struct cpp_reader): Remove import_warning.

	* cpphash.h (struct cpp_reader): Remove import_warning.
	* cpplib.c (skip_rest_of_line): Don't bother turning off
	macro expansion.
	(parse_include): Move include handling to...
	(do_include_common): ... here.  Move import warning from...
	(do_import): ... here.
	(do_pragma_poison): Don't do a callback for poison identifiers.
	* cpplib.h (struct cpp_callbacks): Don't do poison callbacks.
	* cppmain.c (setup_callbacks): Similarly.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44466 138bc75d-0d04-0410-961f-82ee72b054a4