don't set completion-ignore-case to t on w32

[John Paul Wallington]

Back in March 2007 I proposed to remove the setting of
`completion-ignore-case' to t in w32-fns.el for the purpose of
ignoring case on file-name completion now that we have
`read-file-name-completion-ignore-case' that defaults to t on
MS-Windows systems:  
http://article.gmane.org/gmane.emacs.devel/67313

It's after the release.  Can we revisit this issue?  Any objections to
the change below?

--- w32-fns.el  10 Apr 2008 15:09:45 +0100      1.78
+++ w32-fns.el  26 Apr 2008 03:21:34 +0100      
@@ -74,9 +74,6 @@
 (declare-function w32-get-valid-locale-ids "w32proc.c")
 (declare-function w32-set-clipboard-data "w32select.c")
 
-;; Ignore case on file-name completion
-(setq completion-ignore-case t)
-
 ;; Map all versions of a filename (8.3, longname, mixed case) to the
 ;; same buffer.
 (setq find-file-visit-truename t)