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/149607


git-svn-id: http://src.chromium.org/svn/trunk/src/build@20616 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -334,6 +334,9 @@
               '-fno-exceptions',
               '-Wall',
             ],
+            'cflags_cc': [
+              '-fno-threadsafe-statics',
+            ],
           }, { # else: target_arch != "arm"
             'asflags': [
               # Needed so that libs with .s files (e.g. libicudata.a)
@@ -379,6 +382,9 @@
               '-fno-exceptions',
               '-Wall',
             ],
+            'cflags_cc': [
+              '-fno-threadsafe-statics',
+            ],
             'ldflags': [
               '-m32',
             ],