Add ffi support for windows x64 (#357)

* add ffi support for windows x64

* add ffi test

config/ext.json

@@ -63,8 +63,11 @@
     "ffi": {
         "arg-type": "custom",
         "type": "builtin",
-        "lib-depends": [
+        "lib-depends-unix": [
             "libffi"
+        ],
+        "lib-depends-windows": [
+            "libffi-win"
         ]
     },
     "fileinfo": {

config/lib.json

@@ -233,6 +233,17 @@
             "ffitarget.h"
         ]
     },
+    "libffi-win": {
+        "source": "libffi-win",
+        "static-libs-windows": [
+            "libffi.lib"
+        ],
+        "headers-windows": [
+            "ffi.h",
+            "ffitarget.h",
+            "fficonfig.h"
+        ]
+    },
     "libiconv": {
         "source": "libiconv",
         "static-libs-unix": [

config/source.json

@@ -245,6 +245,15 @@
             "path": "LICENSE"
         }
     },
+    "libffi-win": {
+        "type": "git",
+        "rev": "master",
+        "url": "https://github.com/static-php/libffi-win.git",
+        "license": {
+            "type": "file",
+            "path": "LICENSE"
+        }
+    },
     "libiconv": {
         "type": "filelist",
         "url": "https://ftp.gnu.org/gnu/libiconv/",