not valid intrinsic's dot4_neon()

```
The function dot4_neon() uses the intrinsics API which is not correctly handled 
by the project, also it collides with the math_neon.h defined signature.

I just commented it out:

http://gitorious.org/vjaquez-misc/math-neon/commit/3ca3102732e0786350486b52329f0
7392554bd97?format=patch
```

Original issue reported on code.google.com by `cey...@gmail.com` on 25 Mar 2011 at 12:02
