Update android build scripts to copy pngs. Update native with bugfix.

android/ab.cmd

@@ -2,6 +2,7 @@ xcopy ..\flash0 assets\flash0 /s /y
 xcopy ..\lang assets\lang /s /y
 xcopy ..\assets\shaders assets\shaders /s /y
 copy ..\assets\langregion.ini assets\langregion.ini
+copy ..\assets\*.png assets
 SET NDK=C:\AndroidNDK
 SET NDK_MODULE_PATH=..;..\native\ext
 REM Need to force target-platform to android-9 to get access to OpenSL headers.

android/ab.sh

@@ -2,4 +2,5 @@ cp -r ../flash0 assets
 cp -r ../lang assets
 cp -r ../assets/shaders assets
 cp ../assets/langregion.ini assets/langregion.ini
+cp ../assets/*.png assets
 NDK_MODULE_PATH=..:../native/ext $NDK/ndk-build -j3 TARGET_PLATFORM=android-9 $*