Remove src/Makefile.am.

* src/Makefile.am: Rename as...
	* src/local.mk: this.
	Prefix all the paths with src/.
	(AUTOMAKE_OPTIONS): Build object files in the sub dirs.
	(AM_CPPFLAGS): Find find in builddir/src.
	(YACC): Move the flags into...
	(AM_YFLAGS): here.
	* maint.mk (sc_tight_scope): Disable.
	It used to bounce to the version in src/Makefile.am which is now
	part of this very Makefile.
	* Makefile.am, configure.ac: Adjust.
	* src/scan-code-c.c, src/scan-code.l: We can no longer rely on
	include "..." to find files "here": we are no longer in src/, so
	qualify the includes with src/.
	* doc/Makefile.am (PREPATH): No longer include the top_builddir
	prefix.
	(.x.1): Adjust to be able to create src/foo from the top level
	Makefile, instead of going bounce to src/Makefile the creation of
	foo.

configure.ac

@@ -79,7 +79,7 @@ AC_ARG_ENABLE([yacc],
   , [enable_yacc=yes])
 case $enable_yacc in
 yes)
-  YACC_SCRIPT=yacc
+  YACC_SCRIPT=src/yacc
   YACC_LIBRARY=liby.a;;
 *)
   YACC_SCRIPT=
@@ -151,7 +151,7 @@ gt_JAVAEXEC
 AC_CONFIG_FILES([Makefile
 		 po/Makefile.in
 		 examples/calc++/Makefile
-		 lib/Makefile src/Makefile
+		 lib/Makefile
 		 doc/Makefile
 		   doc/yacc.1])
 AC_OUTPUT