libcpp: eliminate LINEMAPS_{ORDINARY,MACRO}_MAPS

libcpp/ChangeLog:
	* include/line-map.h (LINEMAPS_ORDINARY_MAPS): Delete.
	(LINEMAPS_MACRO_MAPS): Delete.
	* line-map.cc (linemap_tracks_macro_expansion_locs_p): Update for
	deletion of LINEMAPS_MACRO_MAPS.
	(linemap_get_statistics): Likewise.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>