Fix unexpected-cfgs by adding api-level-30 feature and removing test

Some code copied from the NDK carried over the respective `feature`
`cfg` guards, without ever adding the feature to the `[features]` list
in `Cargo.toml`.  Now that Rust detects these mishaps, we can fix it
by removing `test` (bindings don't seem to be run-tested) and reexpose
`ConfigurationRef::screen_round()` which was behind a previously
unsettable `feature = "api-level-30"`.

Also remove `unsafe impl Send/Sync for ConfigurationRef` since the
upstream `ndk` already declares `Configuration` to be `Send` and `Sync`,
and `RwLock` and `Arc` carry that through.

Author: MarijnS95

android-activity/Cargo.toml

@@ -27,6 +27,7 @@ rust-version = "1.69.0"
 default = []
 game-activity = []
 native-activity = []
+api-level-30 = ["ndk?/api-level-30"]
 
 [dependencies]
 log = "0.4"

android-activity/src/config.rs

@@ -28,8 +28,6 @@ impl PartialEq for ConfigurationRef {
     }
 }
 impl Eq for ConfigurationRef {}
-unsafe impl Send for ConfigurationRef {}
-unsafe impl Sync for ConfigurationRef {}
 
 impl fmt::Debug for ConfigurationRef {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

android-activity/src/game_activity/ffi.rs

@@ -16,14 +16,14 @@ use jni_sys::*;
 use libc::{pthread_cond_t, pthread_mutex_t, pthread_t};
 use ndk_sys::{AAssetManager, AConfiguration, ALooper, ALooper_callbackFunc, ANativeWindow, ARect};
 
-#[cfg(all(any(target_os = "android", feature = "test"), target_arch = "arm"))]
+#[cfg(all(any(target_os = "android"), target_arch = "arm"))]
 include!("ffi_arm.rs");
 
-#[cfg(all(any(target_os = "android", feature = "test"), target_arch = "aarch64"))]
+#[cfg(all(any(target_os = "android"), target_arch = "aarch64"))]
 include!("ffi_aarch64.rs");
 
-#[cfg(all(any(target_os = "android", feature = "test"), target_arch = "x86"))]
+#[cfg(all(any(target_os = "android"), target_arch = "x86"))]
 include!("ffi_i686.rs");
 
-#[cfg(all(any(target_os = "android", feature = "test"), target_arch = "x86_64"))]
+#[cfg(all(any(target_os = "android"), target_arch = "x86_64"))]
 include!("ffi_x86_64.rs");