Use source_location where it is due

libcpp/

	* directives.c (struct if_stack): Use source_location as type
	here.
	* include/cpplib.h (struct cpp_callbacks)<include, define, undef,
	indent, def_pragma, used_define, used_undef>: Properly use
	source_location as parameter type, rather than unsigned int.

From-SVN: r176333

libcpp/directives.c

@@ -32,7 +32,7 @@ along with this program; see the file COPYING3.  If not see
 struct if_stack
 {
   struct if_stack *next;
-  linenum_type line;		/* Line where condition started.  */
+  source_location line;		/* Line where condition started.  */
   const cpp_hashnode *mi_cmacro;/* macro name for #ifndef around entire file */
   bool skip_elses;		/* Can future #else / #elif be skipped?  */
   bool was_skipping;		/* If were skipping on entry.  */