[scudo] Additional modifications for Android tests support

Summary:
With the recent move of `android_commands` to `sanitizer_common`, some things
have to be updated with regard to Scudo on Android.

Notably:
- `config.android` is dealt with in the common code
- `config.compile_wrapper` can be prepended to allow for the use of the android
  commands
- `SCUDO_OPTIONS` must be passed with the environment when running a test
- `preinit.cpp` fails with some API levels, not sure why, I will have to dig
  into this later.

Note that `check-scudo` is not enabled yet in the bots. It's all local testing
for now until everything looks good.

Reviewers: alekseyshl, vitalybuka

Reviewed By: vitalybuka

Subscribers: srhines, kubamracek, llvm-commits

Differential Revision: https://reviews.llvm.org/D37990

llvm-svn: 313561