v0.8.4: Don't use untrusted Github Action.

• The plugin tries to interoperate with Rust bindgen out of the box by setting CLANG_PATH.
• We no longer invoke cargo for the Gradle clean target.

v0.8.3

• Plugin now supports using prebuilt NDK toolchains.

v0.8.2

0.8.2

• Avoid passing --target to cargo for the default target.
• The exec callback is now invoked as late as possible.
• The CARGO_TARGET_DIR environment variable should now be respected, if it is set.
• Various parts of the plugin's documentation have been improved.