[Android] Apk will crash when set ‘undefined’ arch option

To filter out invalid values for option "arch".

BUG=https://crosswalk-project.org/jira/browse/XWALK-1618
(cherry picked from commit 97ee04f37318c83730c9efbb3e81efed57dd2f11)
Merge pull request #2026 from PeterWangIntel/PR1763

Pr1763