Add msvc.sh wrapper

patches/msvc

@@ -2,9 +2,15 @@ Index: libffi/ChangeLog.libffi
 ===================================================================
 --- libffi.orig/ChangeLog.libffi
 +++ libffi/ChangeLog.libffi
-@@ -1,3 +1,20 @@
+@@ -1,3 +1,26 @@
++2010-01-15  Anthony Green  <green@redhat.com>
++
++	* README: Add notes on building with Microsoft Visual C++.
++
 +2010-01-15  Daniel Witte  <dwitte@mozilla.com>
 +
++	* msvcc.sh: New file.
++
 +	* src/x86/win32.S: Port assembly routines to MSVC and #ifdef.
 +	* src/x86/ffi.c: Tweak function declaration and remove excess
 +	parens.
@@ -918,3 +924,22 @@ Index: libffi/src/x86/win32.S
 +
 +#endif /* !_MSC_VER */
 +
+Index: libffi/README
+===================================================================
+--- libffi.orig/README
++++ libffi/README
+@@ -109,6 +109,14 @@ will add some extra code which will supp
+ are using Purify with libffi. Only use this switch when using 
+ Purify, as it will slow down the library.
+ 
++It's also possible to build libffi on Windows platforms with
++Microsoft's Visual C++ compiler.  In this case, use the msvcc.sh
++wrapper script during configuration like so:
++
++path/to/configure --enable-shared --enable-static \
++	CC=path/to/msvcc.sh LD=link \
++	CPP=\"cl -nologo -EP\"
++
+ Configure has many other options. Use "configure --help" to see them all.
+ 
+ Once configure has finished, type "make". Note that you must be using