Implement a simple SSAA function

Seems that 2x has the best effect for now but this is not the best way
of implementing AA function because it requires much greater video card
memory and memory bandwidth than other avaible methods like MSAA, CSAA
etc.
Merge pull request #383 from leejuiping/ssaa

Implement a simple SSAA function for Windows
Update submodules
Fixed buildfix (i removed the last one, it was bogus)