Fix more compile failures caused by recent ARM toolchain upgrade.

ports/libtommath/build.sh

 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 BUILD_DIR=${SRC_DIR}
 MAKE_TARGETS=mtest
 EXECUTABLES=mtest/mtest${NACL_EXEEXT}
 
+# Workaround for arm-gcc bug:
+# https://code.google.com/p/nativeclient/issues/detail?id=3205
+# TODO(sbc): remove this once the issue is fixed
+if [ "${NACL_ARCH}" = "arm" ]; then
+  NACLPORTS_CPPFLAGS+=" -mfpu=vfp"
+fi
+
 BuildStep() {
   SetupCrossEnvironment
   DefaultBuildStep
 }
 
-#TestStep() {
+TestStep() {
   # To run tests, pipe mtest.nexe output into test.nexe input
   #   mtest/mtest.exe | test.nexe
   # However, this test is setup to run forever, so we don't run
   # it as part of the build.
   #RunSelLdrCommand mtest/mtest.nexe | RunSelLdrCommand test.nexe
-#}
+  return
+}
 
 InstallStep() {
   # copy libs and headers manually
   MakeDir ${DESTDIR_INCLUDE}
   MakeDir ${DESTDIR_LIB}
   LogExecute cp *.h ${DESTDIR_INCLUDE}/
   LogExecute cp *.a ${DESTDIR_LIB}/
 }