Update source to SDL2 2.0.12

Edward Rudd

2020-05-02 03f8528315fa46c95991a34f3325d7b33ae5538c

 source/android-project/app/build.gradle

@@ -13,15 +13,20 @@
        if (buildAsApplication) {
            applicationId "org.libsdl.app"
        }
        minSdkVersion 14
        minSdkVersion 16
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            ndkBuild {
                arguments "APP_PLATFORM=android-14"
                arguments "APP_PLATFORM=android-16"
                abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
            }
            // cmake {
            //     arguments "-DANDROID_APP_PLATFORM=android-16", "-DANDROID_STL=c++_static"
            //     // abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
            //     abiFilters 'arm64-v8a'
            // }
        }
    }
    buildTypes {
@@ -38,6 +43,9 @@
            ndkBuild {
                path 'jni/Android.mk'
            }
            // cmake {
            //     path 'jni/CMakeLists.txt'
            // }
        }
       
    }