issue #1646: Updated spiderMonkey to FF18.0.
issue #1646: Using GNU libstdc++ to build spiderMonkey on Android.
issue #1646: Updated WatermelonWithme project setting for win32.
issue #1646: GCC_OPTIMIZATION_LEVEL=1.
fixed #1646: GCC_OPTIMIZATION=1 for every jsb project setting of debug mode. This can avoid 'vm_protect' error when debugging jsb project on device.
Merge pull request #1826 from dumganhar/iss-1646-spidermonkey18

fixed #1646: Updated spiderMonkey to FF18.0.