www/chromium: add back patch for aarch64

MFH:		2021Q2

www/chromium/files/patch-third__party_zlib_BUILD.gn

@@ -0,0 +1,20 @@
+--- third_party/zlib/BUILD.gn.orig	2021-04-22 11:59:36.597280000 +0200
++++ third_party/zlib/BUILD.gn	2021-04-30 13:06:24.267005000 +0200
+@@ -108,6 +108,8 @@
+       defines = [ "CRC32_ARMV8_CRC32" ]
+       if (is_android) {
+         defines += [ "ARMV8_OS_ANDROID" ]
++      } else if (is_bsd) {
++        defines += [ "ARMV8_OS_FREEBSD" ]
+       } else if (is_linux || is_chromeos) {
+         defines += [ "ARMV8_OS_LINUX" ]
+       } else if (is_mac) {
+@@ -385,7 +387,7 @@
+     ]
+   }
+ 
+-  if (is_apple || is_android || is_nacl) {
++  if (is_apple || is_android || is_nacl || is_bsd) {
+     # Mac, Android and the BSDs don't have fopen64, ftello64, or fseeko64. We
+     # use fopen, ftell, and fseek instead on these systems.
+     defines = [ "USE_FILE32API" ]