ci/android: Switch build to using platform SDK version 26.

In SDK 25 (Android 7, 2016), the kernel only went up to around 4.4, so
the upstreamed sync API didn't exist, and libsync didn't expose
sync_merge().

In SDK 26 (Android 8, 2017), the kernel is sometimes bumped to 4.9 or
4.14, but libsync has a sync_merge() that operates on either the
downstream or the upstream API.

Since our android-targeting drivers in general use sync objects (requiring
a kernel newer than 7 got) and sync_merge() (suggesting interaction with
external fencing that started in Android 8), make CI build against an SDK
version with the sync API.  I think really doing SDK 25 right at this
point would involve backporting mesa with some #ifdefs to not expose sync
APIs that wouldn't work.

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6821>
1 file changed