[PATCH] setup: gcc-4.x compatibility

[Yaakov (Cygwin/X)]

This patch fixes several issues compiling setup.exe with gcc-4.x while
retaining compatibility with gcc-3.4, as tested with gcc-mingw-3.4.4-999
and my mingw-gcc-4.5.1 sample build.  Once we switch to a proper
mingw-gcc cross-compiler, the only change that will need to be made is
to CC/CXX in doconfigure.

OK to apply?


Yaakov

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