fix ClipPlane; change type of equation arg from *float64 to []float64

Awful on my part. Sorry it was late. I believe I fixed it. Going to bed now.

On Jul 3, 2014, at 3:05 AM, Dmitri Shuralyov <notifications@github.com> wrote:

> In gl.go:
> 
> > @@ -187,8 +187,8 @@ func ClearStencil(s int) {
> >  }
> >  
> >  //void glClipPlane (GLenum plane, const float64 *equation)
> > -func ClipPlane(plane GLenum, equation *float64) {
> > -	C.glClipPlane(C.GLenum(plane), (*C.GLdouble)(equation))
> > +func ClipPlane(plane GLenum, equation []float64) {
> > +    C.glClipPlane(C.GLenum(plane), (*C.GLdouble)(&equation[0])
> This is not gofmted.
> 
> —
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-- 
Lawrence E. Bakst
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