Created by: fhahn
For the Android cross build, we fetch Android NDK r10e and set it up to use ld.bfd as ld for the build to work. Newer versions of the Android NDK won't work until #1927 is fixed.
This commit introduces a new DYNAMORIO_CROSS_ANDROID_ONLY environment variable, to allow building for Android on a separate instance, because fetching the NDK might take a while.
Fixes #2207 (closed)