ndk: Add bindings for AFont #1550

Job	Run time
Check overall MSRV (1.64.0)	2m 7s
Check ndk-sys MSRV (1.60.0)	1m 27s
Cross-compile (ubuntu-latest, stable, armv7-linux-androideabi, armeabi-v7a)	1m 36s
Cross-compile (ubuntu-latest, stable, aarch64-linux-android, arm64-v8a)	1m 52s
Cross-compile (ubuntu-latest, stable, i686-linux-android, x86)	1m 25s
Cross-compile (ubuntu-latest, stable, x86_64-linux-android, x86_64)	2m 1s
Cross-compile (ubuntu-latest, nightly, armv7-linux-androideabi, armeabi-v7a)	1m 31s
Cross-compile (ubuntu-latest, nightly, aarch64-linux-android, arm64-v8a)	1m 30s
Cross-compile (ubuntu-latest, nightly, i686-linux-android, x86)	1m 34s
Cross-compile (ubuntu-latest, nightly, x86_64-linux-android, x86_64)	1m 35s
Cross-compile (windows-latest, stable, aarch64-linux-android, arm64-v8a)	3m 21s
Cross-compile (windows-latest, stable, x86_64-linux-android, x86_64)	3m 31s
Build-test docs (ubuntu-latest, stable)	45s
Build-test docs (ubuntu-latest, nightly)	42s
clippy	46s
formatting	16s
Host-side tests (ubuntu-latest, stable)	41s
Host-side tests (ubuntu-latest, nightly)	31s
	27m 11s

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