platform/unix/Makefile patch for Cygwin

[Tony Garnock-Jones]

Lyndon Tremblay wrote:
> A clean CVS checkout builds almost clean in Cygwin.

"uname -o" doesn't work on MacOS X. Would an acceptable alternative to

  ifeq ($(shell uname -o),Cygwin)

be

  ifeq ($(shell uname -s),CYGWIN_NT-5.1)

?

Tony
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