[gold patch]Fix gold build on MacOSX Xcode 3.2.6

[Jing Yu]

The gcc 4.2.1 (Apple Inc. build 5666, dot 3) comes with Xcode 3.2.6
emits warning for "while (0);" and breaks the build (thanks to -Werror
which treat warning as error).  Add "{}" to fix it.

Gold make check passes on x86-64.

2012-06-05  Jing Yu  <jingyu@google.com>

        * gold.h (textdomain): Add {} to empty while(0)
                      (bindtextdomain): Likewise

Index: gold/gold.h
===================================================================
RCS file: /cvs/src/src/gold/gold.h,v
retrieving revision 1.47
diff -u -r1.47 gold.h
--- gold/gold.h	8 Jun 2011 04:43:28 -0000	1.47
+++ gold/gold.h	5 Jun 2012 17:46:46 -0000
@@ -58,8 +58,8 @@
 # define gettext(Msgid) (Msgid)
 # define dgettext(Domainname, Msgid) (Msgid)
 # define dcgettext(Domainname, Msgid, Category) (Msgid)
-# define textdomain(Domainname) while (0) /* nothing */
-# define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
+# define textdomain(Domainname) while (0) {} /* nothing */
+# define bindtextdomain(Domainname, Dirname) while (0) {} /* nothing */
 # define _(String) (String)
 # define N_(String) (String)
 #endif