Optimize release builds and dependencies for size

[link2xt]

We have decided not to enable it previously because of Windows CI failures: #1087

Let's see if it works now.

[link2xt]

This saves around 5 out of 19M (down to 14M) for arm64-v8a android library, although I measured with jsonrpc feature enabled.

[Simon-Laux]

how does this affect runtime performance?

[link2xt]

Size of the APK is reduced roughly from 59M to 54M as a result of this.

Measured by running

$ scripts/ndk-make.sh && ./gradlew --no-daemon assembleGplayDebug && ls -lah build/outputs/apk/gplay/debug/

in the android repo.

[link2xt]

how does this affect runtime performance?

The core does not do anything CPU-intensive except for encryption, so it probably does not change much.

Benchmarking the tests on this branch:

Benchmark 1: cargo test --tests --release -- --skip test_oauth_from_mx --skip test_get_oauth2_token --skip oauth2::tests::test_get_oauth2_addr --skip configure::tests::test_no_panic_on_bad_credentials
  Time (mean ± σ):     23.088 s ±  0.988 s    [User: 89.600 s, System: 56.339 s]
  Range (min … max):   20.172 s … 24.156 s    20 runs

On previous commit:

Benchmark 1: cargo test --tests --release -- --skip test_oauth_from_mx --skip test_get_oauth2_token --skip oauth2::tests::test_get_oauth2_addr --skip configure::tests::test_no_panic_on_bad_credentials
  Time (mean ± σ):     22.603 s ±  0.382 s    [User: 87.051 s, System: 55.246 s]
  Range (min … max):   21.632 s … 23.133 s    20 runs

Benchmarking script is at #4126