OpenGL2: Reduce redundant GL calls.

code/renderergl2/tr_sky.c

@@ -442,7 +442,6 @@ static void DrawSkySide( struct image_s *image, const int mins[2], const int max
 		shaderProgram_t *sp = &tr.lightallShader[0];
 		vec4_t vector;
 
-		GLSL_VertexAttribsState(ATTR_POSITION | ATTR_TEXCOORD);
 		GLSL_BindProgram(sp);
 		
 		GLSL_SetUniformMat4(sp, UNIFORM_MODELVIEWPROJECTIONMATRIX, glState.modelviewProjection);