ndk-sys: Regenerate against NDK r25.0 (build 8775105)

[MarijnS95]

Note that an enum suffix had to be added to AMidi.h to prevent bindgen from erroring out on (EDIT: reported upstream at https://github.com/android/ndk/issues/1739):

~/Android/Sdk/ndk/25.0.8775105/toolchains/llvm/prebuilt/linux-x86_64/sysroot//usr/include/amidi/AMidi.h:230:1: error: must use 'enum' tag to refer to type 'AMidiDevice_Protocol'
~/Android/Sdk/ndk/25.0.8775105/toolchains/llvm/prebuilt/linux-x86_64/sysroot//usr/include/amidi/AMidi.h:230:1: error: must use 'enum' tag to refer to type 'AMidiDevice_Protocol', err: true
thread 'main' panicked at 'Unable to generate bindings: ()', src/main.rs:52:36
stack backtrace:
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Also list this NDK version in the ndk-sys version metadata, exposing it on the crates.io frontpage.