Add Global ThinLTO option (2nd try) am: 8ea56f9da9 am: 370a0be4b8 am: 2d2452c88e

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1857453

Change-Id: Icb241d6fcc759a37036fed7d237553545102ba24