Make compile with gcc 4.7 work

BUG=none
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/428613003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@286775 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -4242,7 +4242,7 @@
               '-Wl,--disable-new-dtags',
             ],
           }],
-          ['gcc_version>=48 and clang==0', {
+          ['gcc_version>=47 and clang==0', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags_cc': [
@@ -4255,7 +4255,7 @@
               }],
             ],
           }],
-          ['host_gcc_version>=48 and clang==0', {
+          ['host_gcc_version>=47 and clang==0', {
             'target_conditions': [
               ['_toolset=="host"', {
                 'cflags_cc': [