Set different arguments for gcc3.x.x and gcc4.x.x. Suppress pointer-sign warning in gcc4.x.x.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1221 6f19259b-4bc3-4df7-8a09-765794883524

Tools/Source/TianoTools/GenFfsFile/build.xml

@@ -38,7 +38,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
         outfile="${BIN_DIR}/${ToolName}"
         outtype="executable"
         optimize="speed">
-      <compilerarg value="${ExtraArgus}" />
+      <compilerarg value="${ExtraArgus}" if="ExtraArgus" />
+
       <fileset dir="${basedir}/${ToolName}" 
         includes="${FileSet}" 
         defaultexcludes="TRUE"