Speculative fix for ChromiumOS(ARM) cross-compile buildbots

R=mstarzinger@chromium.org

TEST=http://build.chromium.org/p/chromium.chromiumos/builders/ChromiumOS%20%28arm%29 build succeeds

Review URL: https://chromiumcodereview.appspot.com/10432004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11643 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

build/common.gypi

@@ -266,7 +266,7 @@
         'target_conditions': [
           ['_toolset=="host"', {
             'variables': {
-              'm32flag': '<!((echo | $(echo ${CXX_host:-${CXX:-$(which g++)}}) -m32 -E - > /dev/null 2>&1) && echo -n "-m32" || true)',
+              'm32flag': '<!((echo | $(echo ${CXX_host:-$(which g++)}) -m32 -E - > /dev/null 2>&1) && echo -n "-m32" || true)',
             },
             'cflags': [ '<(m32flag)' ],
             'ldflags': [ '<(m32flag)' ],