Only build for x86 Android architectures.
Only build for x86 Android architectures.

Change-Id: I06da8a8e48f202d6625c6d6eb8569be3867da13c
Reviewed-on: https://swiftshader-review.googlesource.com/4341
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/4352

bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader