Update to libffi-3.4.2 build

arm64/include/ffitarget.h

@@ -32,7 +32,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 #define FFI_SIZEOF_JAVA_RAW  4
 typedef unsigned long long ffi_arg;
 typedef signed long long ffi_sarg;
-#elif defined(_M_ARM64)
+#elif defined(_WIN32)
 #define FFI_SIZEOF_ARG 8
 typedef unsigned long long ffi_arg;
 typedef signed long long ffi_sarg;
@@ -45,8 +45,13 @@ typedef enum ffi_abi
   {
     FFI_FIRST_ABI = 0,
     FFI_SYSV,
+    FFI_WIN64,
     FFI_LAST_ABI,
+#if defined(_WIN32)
+    FFI_DEFAULT_ABI = FFI_WIN64
+#else
     FFI_DEFAULT_ABI = FFI_SYSV
+#endif
   } ffi_abi;
 #endif
 
@@ -69,22 +74,22 @@ typedef enum ffi_abi
 #define FFI_TRAMPOLINE_CLOSURE_OFFSET FFI_TRAMPOLINE_SIZE
 #endif
 
-#ifdef _M_ARM64
+#ifdef _WIN32
 #define FFI_EXTRA_CIF_FIELDS unsigned is_variadic
 #endif
+#define FFI_TARGET_SPECIFIC_VARIADIC
 
 /* ---- Internal ---- */
 
 #if defined (__APPLE__)
-#define FFI_TARGET_SPECIFIC_VARIADIC
 #define FFI_EXTRA_CIF_FIELDS unsigned aarch64_nfixedargs
-#elif !defined(_M_ARM64)
+#elif !defined(_WIN32)
 /* iOS and Windows reserve x18 for the system.  Disable Go closures until
    a new static chain is chosen.  */
 #define FFI_GO_CLOSURES 1
 #endif
 
-#ifndef _M_ARM64
+#ifndef _WIN32
 /* No complex type on Windows */
 #define FFI_TARGET_HAS_COMPLEX_TYPE
 #endif