[PATCH 5.5.640] cygwin port

Cosmetic changes to pre-processor symbols to conform with
standard Cygwin usage.

* EXTERN.h XSUB.h doio.c ext/POSIX/POSIX.xs ext/SDBM_File/sdbm/pair.c
* ext/SDBM_File/sdbm/sdbm.c mg.c perl.h unixish.h util.c
  Use predefined __CYGWIN__ pre-processor symbol (instead of CYGWIN)

* hints/cygwin.sh lib/ExtUtils/MM_Cygwin.pm
  Remove -DCYGWIN definitions

Eric Fifer

--

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end

• [PATCH 5.5.640] cygwin port by Fifer, Eric