swrast: Remove unused solve_plane_recip().

Unused since commit 9e8a961d.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mesa/swrast/s_aatriangle.c

@@ -111,20 +111,6 @@ solve_plane(GLfloat x, GLfloat y, const GLfloat plane[4])
    ((PLANE[3] + PLANE[0] * (X) + PLANE[1] * (Y)) / -PLANE[2])
 
 
-/*
- * Return 1 / solve_plane().
- */
-static inline GLfloat
-solve_plane_recip(GLfloat x, GLfloat y, const GLfloat plane[4])
-{
-   const GLfloat denom = plane[3] + plane[0] * x + plane[1] * y;
-   if (denom == 0.0F)
-      return 0.0F;
-   else
-      return -plane[2] / denom;
-}
-
-
 /*
  * Solve plane and return clamped GLchan value.
  */