libglib2: remove $(DISABLE_NLS) from configure options

The configure option --disable-nls is not supported anymore in glib
since version 2.0, see file ChangeLog.pre-2-0 line 544.

Patch by Markus Heidelberg.

package/libglib2/libglib2.mk

@@ -45,7 +45,7 @@ LIBGLIB2_CONF_ENV =	\
 		gt_cv_c_wchar_t=$(if $(BR2_USE_WCHAR),yes,no)
 
 LIBGLIB2_CONF_OPT = --enable-shared \
-		--enable-static $(DISABLE_NLS)
+		--enable-static
 
 LIBGLIB2_DEPENDENCIES = uclibc gettext libintl pkgconfig