* input.h:  Don't #include line-map.h.  It may cause link problems
	with undefined linemap_line_start when line-map.h is included but
	line-map.o is not linked, as currently happens with gengtype on
	compilers that don't support inline.
	* toplev.c:  So we do have to explicitly #include line-map.h here.

From-SVN: r78185