Android: Check for for ANDROID_HOME env var in check()
Android: Check for for ANDROID_HOME env var in check()

The crosswalk ant build scripts reference ANDROID_HOME through
the sdk.dir variable, so test whether it is set in the
environment.

crosswalk-project/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,baleboy/crosswalk-app-tools,baleboy/crosswalk-app-tools,baleboy/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools