build: update gnulib for linux 2.6.9 nanosleep workaround

Also, do the following to avoid "make syntax-check" failure
induced by new rules.
* .x-sc_bindtextdomain: Exempt files with an #ifdef'd "main".
* Makefile.am: Add this file.

.x-sc_bindtextdomain

@@ -0,0 +1,7 @@
+^gl/lib/randint\.c$
+^gl/tests/test-di-set\.c$
+^gl/tests/test-fadvise\.c$
+^gl/tests/test-ino-map\.c$
+^gl/tests/test-mbsalign\.c$
+^gl/tests/test-rand-isaac\.c$
+^lib/euidaccess-stat\.c$

Makefile.am

@@ -41,6 +41,7 @@ changelog_etc =				\
 
 syntax_check_exceptions =		\
   .x-sc_GPL_version			\
+  .x-sc_bindtextdomain			\
   .x-sc_error_message_uppercase		\
   .x-sc_file_system			\
   .x-sc_obsolete_symbols		\