update gcc48 to 4.8.0 release and change libstdc++-devel subport to libstdc++

[howarth@…]

The attached Portfile.diff updates the gcc48 Portfile to build the 4.8.0 release. It also merges in the differences with the gcc47 Portfile such as using ecj (which is required for gcj to compile java). This works fine on darwin10 and later which have the compatibility unwinder. It also adds the skip-libffi-install.patch patch from upstream. The gcc 4.8.0 release, which has an remerge of upstream libffi) installs files which conflict with a libffi package. The patch prevents libffi from installing as it is unnecessary at run time. The libffi static lib is only used as a convenience library in building libgcj and libffi doesn't need to be installed. The new Portfile also switches the libstdc++-devel subport to the libstdc++ subport.

[howarth@…]

patch to skip installation of libffi

[ryandesign (Ryan Carsten Schmidt)]

This had previously been requested in #38500.

As mentioned in comment:ticket:38500:6, the epoch must be increased, otherwise users will not be prompted to upgrade.

If the libstdcxx-devel subport is changed to libstdcxx, as I agree it probably should be, then the libstdcxx subport needs to be removed from the gcc47 port in the same commit, otherwise there will be indexing problems.

[howarth@…]

Updated the Portfile diff in order to eliminate the usage of two different unwinders with code linked against libstdc++. See ticket 38732.

[howarth@…]

add requested epoch