Use Android SDK version of CMake rather than an external one
Use Android SDK version of CMake rather than an external one

Summary:
This diff updates the CMake command used for configuring the Hermes build
from `cmake` from $PATH to the `cmake` bundled with the Android SDK.
If not found, fallsback to the previous behavior.

This relaxes the requirement of having to ask our users to install CMake
in their CLIs.

Changelog:
[Internal] [Changed] - Use Android SDK version of CMake rather than an external one

Reviewed By: neildhar

Differential Revision: D35931306

fbshipit-source-id: 8d6c554e5e9040e3bd4fed5f72fbdb0eb61d745a

janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,javache/react-native,javache/react-native,facebook/react-native