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This is required to build the 64-bit Windows cross-toolchains
(since the configure script of earlier releases barfs sadly on
x86_64-w64-mingw32 and thinks it runs under Cygwin).

Chances that this introduces regressions in gcc-4.4.3 and gcc-4.6
builds are pretty slim, imho.

Change-Id: Iac80d724653cb254148cb4b4305d1f0daafb9a4f