[build] Add android platform to official-archive file filter

TBR=mathias@chromium.org
NOTRY=true

Bug: v8:5918
Change-Id: Ifcc1b2dc3aa230f30893deb0209eafa31384a263
Reviewed-on: https://chromium-review.googlesource.com/554772
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46316}

tools/release/filter_build_files.py

@@ -33,6 +33,7 @@ SUPPLEMENTARY_FILES = [
 ]
 
 LIBRARY_FILES = {
+  'android': ['*.a', '*.so'],
   'linux': ['*.a', '*.so'],
   'mac': ['*.a', '*.so'],
   'win': ['*.lib', '*.dll'],