[native] Build Folly on Android
Summary:
I took @karol-bisztyga's Gradle code from here, and then added the add_definitions line to CMakeLists.txt.
I got the list of Folly flags from here. Details on how I figured out that we need to use add_definitions are on the Notion issue.
Test Plan: Tested in combination with following diff
Reviewers: karol-bisztyga, palys-swm
Reviewed By: karol-bisztyga, palys-swm
Subscribers: KatPo, Adrian, atul, karol-bisztyga
Differential Revision: https://phabricator.ashoat.com/D1133