[gtk-builder-win] Update libffi to version 3.1

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 53180538aa2eff6dc28f012f8b4621f5def3f690
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Fri Jun 27 09:26:38 2014 +0200

    Update libffi to version 3.1

 win32/libs/11_libffi.bat |    2 +-
 win64/libs/11_libffi.bat |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/win32/libs/11_libffi.bat b/win32/libs/11_libffi.bat
index dc0a307..f61afb8 100644
--- a/win32/libs/11_libffi.bat
+++ b/win32/libs/11_libffi.bat
@@ -1,4 +1,4 @@
-MODVER=3.0.12
+MODVER=3.1
 
 mkdir -p 11_libffi
 cd 11_libffi
diff --git a/win64/libs/11_libffi.bat b/win64/libs/11_libffi.bat
index 2d9c3fd..4b2bc7e 100644
--- a/win64/libs/11_libffi.bat
+++ b/win64/libs/11_libffi.bat
@@ -1,4 +1,4 @@
-MODVER=3.0.12
+MODVER=3.1
 
 mkdir -p 11_libffi
 cd 11_libffi