[automerger skipped] Merge "Add MODULE_BUILD_FROM_SOURCE env variable." into sc-dev am: 14abe199 am: 5301b846 -s ours

am skip reason: Merged-In Ie7f928674a511a98f17653fa814a42194ee0e9f9 with SHA-1 f753bc58 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/15090043

Change-Id: Ie8c26584cd357b08de90af7abdb2f15dfe0db0f3