android: target android-19 by default when building with build-scripts/androidbuildlibs.sh

build-scripts/androidbuildlibs.sh

@@ -68,6 +68,6 @@ ndk-build \
     NDK_LIBS_OUT=$lib \
     APP_BUILD_SCRIPT=Android.mk \
     APP_ABI="armeabi-v7a arm64-v8a x86 x86_64" \
-    APP_PLATFORM=android-16 \
+    APP_PLATFORM=android-19 \
     APP_MODULES="SDL2 SDL2_main" \
     $ndk_args