Vendor OpenSSL on android with google prebuilt libs (#4511)

* vendor android openssl

* add fallback

* dont panic

packages/cli/assets/android/prebuilt/README.md

@@ -0,0 +1,13 @@
+This folder contains prebuilt versions of android crates to make cross-compiling easier.
+
+We use the official prebuilds distributed by google.
+
+You can find the full set of prebuilt libraries that google distributes here:
+
+https://maven.google.com/web/index.html?q=com.android.ndk.thirdparty#com.android.ndk.thirdparty
+
+The version included in `dx` is downloaded from here:
+
+https://maven.google.com/web/index.html?q=com.android.ndk.thirdparty#com.android.ndk.thirdparty:openssl:1.1.1q-beta-1
+
+The SHA of the `.aar` file from google and `dx` are different. The Rust openssl-sys crate expects libcrypto and libssl to be in the same folder, but the `.aar` that google distributes splits the two libraries into two different folders. I (jon) have simply merged the folders together and then re-packed the folder as a `.tar.gz`.