package/libffi: bump to version 3.3

Update hash for license file (update in year:
https://github.com/libffi/libffi/commit/058aa4130445b4ef3c2f77f796c33506873031ca)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libffi/libffi.hash

@@ -1,4 +1,4 @@
 # Locally calculated
-sha256	db41cfb9ec8052fcd116a94c12237303c4447af4844d50e4fea7163661e31743  libffi-3.3-rc0.tar.gz
+sha256	3f2f86094f5cf4c36cfe850d2fe029d01f5c2c2296619407c8ba0d8207da9a6b  libffi-3.3.tar.gz
 # License files, locally calculated
-sha256	0f4d7a0bfb83c37465d42dc305f124189196cc0cc2cc8d6f8461103682aebbc5  LICENSE
+sha256	deaf3a42effb551a5b140fa9afefed183a27f1341c6d1bf430d106a5e6931fc0  LICENSE

package/libffi/libffi.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBFFI_VERSION = 3.3-rc0
+LIBFFI_VERSION = 3.3
 LIBFFI_SITE = $(call github,libffi,libffi,v$(LIBFFI_VERSION))
 LIBFFI_LICENSE = MIT
 LIBFFI_LICENSE_FILES = LICENSE