[patch config.gcc]: Add a missed 64-bit cygwin case

[Kai Tietz]

Hi,

One missing nit in config.gcc to choose proper cpu default and split
cygwin and mingw targets.

ChangeLog

2013-09-11  Kai Tietz  <kti...@redhat.com>

    * config.gcc: Separate cases for mingw and cygwin targets,
    and add 64-bit cygwin target case.

Tested for x86_64-pc-cygwin, i686-pc-cygwin, i686-w64-mingw32, and for
x86_64-w64-mingw32.  I will apply this patch in a cuple of hours, if
there are no objections.

Regards,
Kai

Index: config.gcc
===================================================================
--- config.gcc    (Revision 202491)
+++ config.gcc    (Arbeitskopie)
@@ -3858,8 +3858,10 @@ case ${target} in
         ;;
     i[34567]86-*-solaris2* | x86_64-*-solaris2.1[0-9]*)
         ;;
-    i[34567]86-*-cygwin* | i[34567]86-*-mingw* | x86_64-*-mingw*)
+    i[34567]86-*-cygwin* | x86_64-*-cygwin*)
         ;;
+    i[34567]86-*-mingw* | x86_64-*-mingw*)
+        ;;
     i[34567]86-*-freebsd* | x86_64-*-freebsd*)
         ;;
     ia64*-*-linux*)