The gomobile bind command outputs an .aar file ready to include in an
Android project. If the including project use the minifyEnabled gradle
option the field go.Seq.memptr will be removed since it is only referenced
from C code.
Instruct the minifier to keep all go.* java code by adding an appropriate
proguard.txt file to the .aar file.
Change-Id: Ia1e89a5d8f4b4f349f9c2cf4d0dba2628557fdf9
Reviewed-on: https://go-review.googlesource.com/9802
Reviewed-by: David Crawshaw <crawshaw@golang.org>