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c97dafde - build: Handle 'environ' global variable differently on cygwin x86_64

build: Handle 'environ' global variable differently on cygwin x86_64 Problem reported by Vasyl Khalak in: <https://cygwin.com/ml/cygwin/2013-06/msg00228.html>. * lib/execute.c.diff: New file. * lib/spawn-pipe.c.diff: Likewise. * Makefile.am (EXTRA_DIST): Add new patches.