Latest Cygwin Xpm-noX package breaks configure (with patch to configure.ac)

[Rick Rankin]

A recent update to the Cygwin Xpm package has caused a problem with XEmacs configure when configuring for a non-X Cygwin build. The Cygwin folks renamed the library from libXpm.a to libXpm-noX.a. With the attached patch to configure.ac, configure can find the correct library.

I tested the patch on Cygwin with no-X, X-only, and combined builds, as well as on Linux (Fedora Core 6). Everything worked except the X-only Cygwin build, which failed to link because of undefined externals from src/intl-auto-encap-win32.c. I'm not sure if this file should even be used in an X-only build. It's also not clear how common an X-only build on Cygwin is, or if this issue is even worth fixing. An X-only build is an option, however, which is why I tested it.

--Rick
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