adjust android min SDK to 19 and remove test sources from SDL lib

Edward Rudd

2021-06-15 485e9a0ba1fc4688b1cccca55b3c0af628675b07

 source/android-project/app/build.gradle

@@ -8,18 +8,18 @@
}

android {
    compileSdkVersion 26
    compileSdkVersion 30
    defaultConfig {
        if (buildAsApplication) {
            applicationId "org.libsdl.app"
        }
        minSdkVersion 16
        targetSdkVersion 26
        minSdkVersion 19
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            ndkBuild {
                arguments "APP_PLATFORM=android-16"
                arguments "APP_PLATFORM=android-19"
                abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
            }
            // cmake {