Add -fno-threadsafe-statics to the Linux build.

We already depend on our static initializers being thread safe, since
MSVC does not implement locking around static initialization.  This avoids
extra locking (__cxa_guard_acquire / __cxa_guard_release).

Review URL: http://codereview.chromium.org/126267


git-svn-id: http://src.chromium.org/svn/trunk/src/build@18700 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -350,6 +350,7 @@
             'cflags': [
               '-m32',
               '-fno-exceptions',
+              '-fno-threadsafe-statics',
               '-Wall',
             ],
             'ldflags': [