Update how we build bind.keys.h (both POSIX and Windows)
The code in util/bindkeys.pl was overly complicated and it could not be reused on Windows because redirecting stdin and stdout at the same time from perl is overly complicated. Now the util/bindkeys.pl accepts the input file as the first and only argument and prints the header file to stdout. This allows the same utility to be used from automake and win32/Configure script.
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