Android CMake 指定 ndk 版本

android {
    compileSdk 31

    defaultConfig {
        ...
        ndkVersion '21.3.6528147'
        externalNativeBuild {
            cmake {
                cppFlags ''
            }
        }
        ndk {
            abiFilters 'x86', 'armeabi-v7a', 'arm64-v8a'
        }
    }
}