lang/gcc-aux 4.7.1: Upgrade to version 4.7.2

The GCC projected released version 4.7.2 on 20 September.  There were few
diff changes (only core and ada) between it and version 4.7.1, so it's a
straightforward update.

Release announcement: http://gcc.gnu.org/ml/gcc/2012-09/msg00181.html

Notable Excerpts:
GCC 4.7.2 is the first bug-fix release containing important fixes for
regressions and serious bugs in GCC 4.7.1 with over 70 bugs fixed since
the previous release

A notable change in GCC 4.7.2 compared to 4.7.1 are ABI bug fixes
related to some C++11 templates (std::list and std::pair).  As a result,
code using those templates in C++11 mode is again ABI compatible with
code in C++03/C++98 mode or C++11 mode of GCC 4.6 and earlier, but might
be ABI incompatible with code compiled by GCC 4.7.1 or 4.7.0 in C++11
mode.

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