Added libffi patch accidentally ommitted.

Author: freakboy3742

patch/libffi/generate-darwin-source-and-headers.py.patch

@@ -0,0 +1,20 @@
+--- libffi-3.1-old/generate-darwin-source-and-headers.py  2014-10-23 17:49:33.000000000 +0800
++++ libffi-3.1-new/generate-darwin-source-and-headers.py  2014-10-23 17:50:01.000000000 +0800
+@@ -14,7 +14,7 @@
+     sdk = 'iphonesimulator'
+     arch = 'i386'
+     triple = 'i386-apple-darwin11'
+-    version_min = '-miphoneos-version-min=5.1.1'
++    version_min = '-miphoneos-version-min=6.0'
+
+     prefix = "#ifdef __i386__\n\n"
+     suffix = "\n\n#endif"
+@@ -40,7 +40,7 @@
+     sdk = 'iphoneos'
+     arch = 'armv7'
+     triple = 'arm-apple-darwin11'
+-    version_min = '-miphoneos-version-min=5.1.1'
++    version_min = '-miphoneos-version-min=6.0'
+
+     prefix = "#ifdef __arm__\n\n"
+     suffix = "\n\n#endif"