gnulib: update.

* gnulib: Update to latest.
	* lib/.cvsignore, lib/.gitignore, m4/.cvsignore,
	* m4/.gitignore: Regen.
	* src/symtab.c (symbol_from_uniqstr, semantic_type_from_uniqstr):
	Call xalloc_die on hash_insert failures.
	Requested by the new __warn_unused_result__ attribute of
	hash_insert.

m4/.cvsignore

@@ -39,6 +39,7 @@ mbrtowc.m4
 mbsinit.m4
 mbstate_t.m4
 mbswidth.m4
+memchr.m4
 multiarch.m4
 nls.m4
 po.m4

m4/.gitignore

@@ -39,6 +39,7 @@
 /mbsinit.m4
 /mbstate_t.m4
 /mbswidth.m4
+/memchr.m4
 /multiarch.m4
 /nls.m4
 /po.m4