maint: address sc_bindtextdomain, sc_program_name and sc_prohibit_HAVE_MBRTOWC.

* bootstrap.conf (gnulib_modules): Require progname.
	* src/complain.c, src/getargs.c, src/getargs.h, src/main.c: Use it.
	* cfg.mk (exclude): New.
	Use it.
	Skip lib/main.c for bindtextdomain and set_program_name.
(cherry picked from commit 4d699f44e6)

Conflicts:

	cfg.mk

src/main.c

@@ -24,6 +24,7 @@
 #include <bitset_stats.h>
 #include <bitset.h>
 #include <configmake.h>
+#include <progname.h>
 #include <quotearg.h>
 #include <timevar.h>
 
@@ -57,7 +58,7 @@
 int
 main (int argc, char *argv[])
 {
-  program_name = argv[0];
+  set_program_name (argv[0]);
   setlocale (LC_ALL, "");
   (void) bindtextdomain (PACKAGE, LOCALEDIR);
   (void) bindtextdomain ("bison-runtime", LOCALEDIR);