Initial Android client CI is implemented.
Some fixes in build scripts made to enable CI build cache for OpenSSL and CURL.
Signed-off-by: Vitalii Koshura <lestat.de.lionkur@gmail.com>
* Make build scripts fully whitespace safe to the extend premitted by autotools
* Let all build scripts fail fast on error, previously they would continue and then fail with spurious follow-up errors burrowing the actual issue
* Ensure that all build scripts start with a valid shebang (`#!`)
* Fix jumbled letters in `android/build_build_app_x86.sh`
Vitalii Koshura