Update to Android NDK r23c

Android NDK is updated from legacy ndk-bundle stuck at unsupported
r22b to LTS NDK r23c (23.2.8568313).

Since GNU binutils have been removed from NDK since r23 (see
https://github.com/android/ndk/wiki/Changelog-r23), ndk-make.sh now
uses TARGET_AR=llvm-ar and uses a workaround for `-lgcc` requirement.

Android command line tools used in the Dockerfile are updated to build
8512546

Preview APKs now use NDK r23c too.

.github/workflows/preview-apk.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: nttld/setup-ndk@v1
         id: setup-ndk
         with:
-          ndk-version: r21d
+          ndk-version: r23c
 
       - name: Compile core
         env: