Make IMPORTED_GNULIB_MODULES in alphabetical order

Since we'll add more modules in this list, better to keep them in
alphabetical order.

gdb:

	* gnulib/update-gnulib.sh: Make IMPORTED_GNULIB_MODULES in
	alphabetical order.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2014-11-21  Yao Qi  <yao@codesourcery.com>
+
+	* gnulib/update-gnulib.sh: Make IMPORTED_GNULIB_MODULES in
+	alphabetical order.
+
 2014-11-21  Joel Brobecker  <brobecker@adacore.com>
 
 	* gdbtypes.c (create_range_type): Unset RESULT_TYPE's

gdb/gnulib/update-gnulib.sh

@@ -30,17 +30,17 @@
 
 # The list of gnulib modules we are importing in GDB.
 IMPORTED_GNULIB_MODULES="\
+    dirent \
     dirfd \
     fnmatch-gnu \
     frexpl \
     inttypes \
     memmem \
-    update-copyright \
-    unistd \
     pathmax \
     strstr \
-    dirent \
     sys_stat \
+    unistd \
+    update-copyright \
 "
 
 # The gnulib commit ID to use for the update.