bug#942: NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll

[Joshua S.]

Xpm enabled NTEmacs hangs if your %PATH% includes cygwin\usr\X11R6\bin.
LoadLibrary("libxpm.dll") never returns in w32_delayed_load() in 
src/image.c.

Since the most cygwin DLLs are not meant to be loaded by non-cygwin apps 
(if you do, they hang),
I suggest we simply remove "libxpm.dll" and "libXpm-nox4.dll" from 
image-library-alist.
(AFAIK Emacs on Cygwin does not use this variable.)

Index: lisp/term/w32-win.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/term/w32-win.el,v
retrieving revision 1.105
diff -u -d -w -r1.105 w32-win.el
--- lisp/term/w32-win.el    11 Aug 2008 01:23:07 -0000    1.105
+++ lisp/term/w32-win.el    9 Sep 2008 10:03:39 -0000
@@ -199,7 +199,7 @@

 ;;; Set default known names for image libraries
 (setq image-library-alist
-      '((xpm "libxpm.dll" "xpm4.dll" "libXpm-nox4.dll")
+      '((xpm "xpm4.dll")
         (png "libpng12d.dll" "libpng12.dll" "libpng.dll"
      ;; these are libpng 1.2.8 from GTK+
      "libpng13d.dll" "libpng13.dll")