Fix shaders not working in Eevee

Not a single node based shader was working since a recent merge from
master.

The merge brought changes from the principle bsdf shader where
unsupported gl_ProjectionMatrix was still being used.

source/blender/gpu/shaders/gpu_shader_material.glsl

@@ -2657,7 +2657,7 @@ void node_bsdf_principled(vec4 base_color, float subsurface, vec3 subsurface_rad
 	float eta = (2.0 / (1.0 - sqrt(0.08 * specular))) - 1.0;
 
 	/* set the viewing vector */
-	vec3 V = (gl_ProjectionMatrix[3][3] == 0.0) ? -normalize(I) : vec3(0.0, 0.0, 1.0);
+	vec3 V = (ProjectionMatrix[3][3] == 0.0) ? -normalize(I) : vec3(0.0, 0.0, 1.0);
 
 	/* get the tangent */
 	vec3 Tangent = T;