I have just updated the mingw-w64 headers, runtime, and winpthreads to
4.0.6-1.

mingw64-*-headers-4.0.6-1
mingw64-*-runtime-4.0.6-1
mingw64-*-winpthreads-4.0.6-1

Here are some of the notable fixes:
* Fix scanf memleak
* mkstemp should no longer delete files if file handle is closed.
* call _fpreset on each thread created so fp math are consistent across
threads.

The cross compiler can produce Win32 and Win64 native binaries. As a
cross compiler, you may use --host=i686-w64-mingw32 or
--host=x86_64-w64-mingw32 for autotools based source packages to build
for Windows.

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