Upgrade gcc please

[Jerry D. Hedden]

The gcc version for Cygwin is currently 3.4.4, which was release by
the gcc group in May '05.  Since then 3.4.5 and 3.4.6 have been
release.  In addition, gcc 4 has been released with the lastest
version being 4.2.1.

gcc 4 support mudflaps for finding memory issues.  I'm sure many would
find that useful.

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