There is some cleanup to be done in this package now, but I'm
deferring it until later in the cycle.
We should probably also change the semantics slightly: main should
be called for all-Go apps (that is, apps that use NativeActivity),
but it would be more consistent with buildmode=c-shared and c-archive
if we did not call main for Go shared libraries being included in
Java android apps.
Change-Id: I13ca797a478edb22b0c602c1ee6e616fe4fea1e6
Reviewed-on: https://go-review.googlesource.com/9016
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>