build/core: Apply more compiler optimizations

flags taken from VanirAOSP

Change-Id: Id9f3c54d1ced3ac42319fa6be8822eff590aa434

Specify -msse3 on host as on target.

Make the host and the target x86 build more uniform by using the same machine flags.
Its unlikely Android has ever been built on a machine without SSE3 support.

Bug: 8068608
Change-Id: I19635528b61bf2c6faf02c2e575b1d9bf8025d3a