0aef6454 added a new dependency on Reactor/EmulatedReactor.cpp which was not referenced by Android.bp. Add it to fix the build.

Bug: b/145754674
Change-Id: Id9bac3c9e94edc97959b2a8c1d4abe10f7b78719
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40976Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Ben Clayton <bclayton@google.com>