[Android][fix #18] enable VM_FIXNUM_ENABLED
[Android][fix #18] enable VM_FIXNUM_ENABLED

At least, "samples/ui_demo" works with this patch and commits until https://github.com/HipByte/Flow/commit/42c33cc4abff6ac736e7c0977835646e39a86247

HipByte/Flow,hboon/Flow,HipByte/Flow,hboon/Flow,HipByte/Flow,hboon/Flow,HipByte/Flow,hboon/Flow