build: added vendored openssl-sys dependency on Android

[ErikBjare]

See: https://users.rust-lang.org/t/rust-on-android-today/17884/14?u=erikbjare

[codecov]

Codecov Report

Merging #135 into master will increase coverage by 28.56%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #135       +/-   ##
===========================================
+ Coverage   13.54%   42.10%   +28.56%     
===========================================
  Files           9       11        +2     
  Lines         443      665      +222     
  Branches       79      105       +26     
===========================================
+ Hits           60      280      +220     
+ Misses        373      344       -29     
- Partials       10       41       +31     

Impacted Files	Coverage Δ
aw-models/src/duration.rs	15.62% <0.00%> (-0.51%)	⬇️
aw-client-rust/src/lib.rs	78.31% <0.00%> (ø)
aw-sync/tests/sync.rs	88.29% <0.00%> (ø)
aw-server/src/macros.rs	2.02% <0.00%> (+2.02%)	⬆️
aw-sync/src/sync.rs	36.55% <0.00%> (+36.55%)	⬆️
aw-models/src/event.rs	80.00% <0.00%> (+80.00%)	⬆️
aw-models/src/bucket.rs	85.71% <0.00%> (+85.71%)	⬆️

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