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77ca8fde - Fix link error when building with --disable-shared on 64-bit Cygwin.

Fix link error when building with --disable-shared on 64-bit Cygwin. * gnulib-local/lib/execute.c.diff: Remove file. * gnulib-local/lib/spawn-pipe.c.diff: Remove file. * gnulib-local/tests/test-environ.c.diff: Remove file. * gnulib-local/Makefile.am (EXTRA_DIST): Remove them.