tools: Fix LocalPath on Cygwin

The LocalPath() function must not replace /cygdrive/x with x:
This used to be necessary when mixing win32 and cygwin tools,
but we tell users not to do that any more.  This problem only
appears if the path to base starts with /cygdrive/x.

src/tools/EPICS/Path.pm

@@ -64,7 +64,6 @@ put into a file.  It converts paths from the Unix form that Perl understands to
 any necessary external representation, and also removes automounter prefixes to
 put the path into its canonical form.
 
-On cygwin we convert cygdrive paths to their equivalent Windows drive specs. 
 Before Leopard, the Mac OS X automounter inserted a verbose prefix, and in case
 anyone is still using SunOS it adds its own prefix as well.
 
@@ -72,9 +71,7 @@ anyone is still using SunOS it adds its own prefix as well.
 
 sub LocalPath {
     my ($newpath) = @_;
-    if ($^O eq 'cygwin') {
-        $newpath =~ s{^/cygdrive/([a-zA-Z])/}{$1:/};
-    } elsif ($^O eq 'darwin') {
+    if ($^O eq 'darwin') {
         # Darwin automounter
         $newpath =~ s{^/private/var/auto\.}{/};
     } elsif ($^O eq 'sunos') {