maint: improve sc_prohibit_strncmp syntax check

* .gnulib: Update, for sc_prohibit_strcmp fix.
* cfg.mk: Adjust copyright; the only FSF portions come from when
this file was copied from coreutils.
(sc_prohibit_strncmp): Copy bug-fixes from sc_prohibit_strcmp.
* .x-sc_prohibit_strcmp: Delete, now that rule is smarter.
* .x-sc_prohibit_strncmp: Likewise.
* Makefile.am (syntax_check_exceptions): Track deletion.

.gnulib @ 97790558

-Subproject commit 4f2c339efdaf1fcca9eed7b0700083b5e24942d4
+Subproject commit 9779055889c2715b593930e39ead552759b5ddc2

.x-sc_prohibit_strcmp

-^gnulib/

.x-sc_prohibit_strncmp

-^src/internal\.h$

Makefile.am

@@ -33,8 +33,6 @@ syntax_check_exceptions = \
   .x-sc_prohibit_nonreentrant \
   .x-sc_prohibit_readlink \
   .x-sc_prohibit_sprintf \
-  .x-sc_prohibit_strcmp \
-  .x-sc_prohibit_strncmp \
   .x-sc_prohibit_strncpy \
   .x-sc_prohibit_test_minus_ao \
   .x-sc_prohibit_VIR_ERR_NO_MEMORY \

cfg.mk

 # Customize Makefile.maint.                           -*- makefile -*-
-# Copyright (C) 2003-2010 Free Software Foundation, Inc.
+# Copyright (C) 2008-2011 Red Hat, Inc.
+# Copyright (C) 2003-2008 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -250,9 +251,9 @@ sc_prohibit_close:
 # Similar to the gnulib maint.mk rule for sc_prohibit_strcmp
 # Use STREQLEN or STRPREFIX rather than comparing strncmp == 0, or != 0.
 sc_prohibit_strncmp:
-	@grep -nE '! *str''ncmp *\(|\<str''ncmp *\([^)]+\) *=='		\
+	@grep -nE '! *str''ncmp *\(|\<str''ncmp *\(.+\) *[!=]='		\
 	    $$($(VC_LIST_EXCEPT))					\
-	  | grep -vE ':# *define STREQ\(' &&				\
+	  | grep -vE ':# *define STR(N?EQLEN|PREFIX)\(' &&		\
 	  { echo '$(ME): use STREQLEN or STRPREFIX instead of str''ncmp' \
 		1>&2; exit 1; } || :