fix gcc check

openpkg/rpmtool

@@ -412,7 +412,7 @@ case $tool in
             echo "$mflags"
         elif [ ".$opt_c" = .yes ]; then
             isgcc=no
-            if [ ".`$tool --version 2>/dev/null | grep '[23]\.[789]'`" != . ]; then
+            if [ ".`$tool --version 2>/dev/null | egrep '(2.[789]|3.[01])'`" != . ]; then
                 isgcc=yes
             fi
             cflags=''