remove get_programCount from stdlib

stdlib.ispc

@@ -5158,12 +5158,3 @@ __declspec(safe)
 static unmasked inline int16 avg_down(int16 a, int16 b) {
     return __avg_down_int16(a, b);
 }
-
-
-// Added so programmers can query programCount
-// at runtime from C/C++.
-// This is useful for using varying 
-// structures with exported functions
-export uniform int32 get_programCount() {
-  return programCount;
-}