* cpphash.h (struct printer): New from cppmain.c.

	* cpphash.h (struct printer): New from cppmain.c.
	(cpp_reader): New member.
	* cppmain.c (struct printer): Move to cpphash.h.
	(options, print): Remove.
	(account_for_newlines, print_line, maybe_print_line,
	cpp_preprocess_file, setup_callbacks, scan_translation_unit,
	scan_translation_unit_trad, cb_line_change, cb_ident,
	cb_define, cb_undef, cb_include, cb_file_change, dump_macro,
	cb_def_pragma): Make reentrant.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@56233 138bc75d-0d04-0410-961f-82ee72b054a4