D10462: Android toolchain: add ANDROID_COMPILER_PREFIX variable.

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10462

To: dfaure, apol, mart
Cc: #build_system, #frameworks, michaelh