Revert "Modules: Add an Andriod platform file"

This reverts commit 77f06b145d57c4665ff5d71b89a70c54a009ad14.

It may be re-added in the future when the requirements for that
platform are better known and supported by CMake.

Modules/Platform/Android.cmake

@@ -1,5 +0,0 @@
-include(Platform/Linux)
-set(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "")
-# RPath is useless on Android, because we can't determine the installation
-# location ahead of time.
-set(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "")