Merge branch 'ml/cygwin-updates'

The tip one does _not_ revert c869753e (Force core.filemode to false on Cygwin., 2006-12-30) on purpose, so that people can still retain the old behaviour if they wanted to. * ml/cygwin-updates: cygwin: stop forcing core.filemode=false Cygwin 1.7 supports mmap Cygwin 1.7 has thread-safe pread Cygwin 1.7 needs compat/regex