Forward port revision 282369  which carried the following description:
On the way rename %%GCC_VER%% in pkg-plist to %%GCC_VERSION%% and
make the Makefile machinery a bit more generic to minimize differences
between lang/gcc ports based on releases and those based on snapshots.
On the way, update to the 20120929 snapshot of GCC 4.7.3.
Submitted by: jkim