bug: eshell doesn't know about cygwin

On a Cygwin XEmacs, eshell-binary-suffixes defaults to '("") when it should be '(".exe" ".com" ".bat" ".cmd" ""). As a result an eshell user in a Cygwin XEmacs must use the full filename of an external command, e.g. foo.exe This inline predicate: (defsubst eshell-under-windows-p () "Return non-nil if we are running under MS-DOS/Windows." (memq system-type '(ms-dos windows-nt))) returns nil in Cygwin. It would be easy to include the value of system-type for a Cygwin build in this test, but that's not the right thing. It's probably the case that eshell should treat a Cygwin build as Unix sometimes and Windows others. -- John Paul Wallington