Removed gl_PerVertex overrides

Fixes #509

data/shaders/geometryshader/base.vert

@@ -1,18 +1,10 @@
 #version 450
 
-#extension GL_ARB_separate_shader_objects : enable
-#extension GL_ARB_shading_language_420pack : enable
-
 layout (location = 0) in vec3 inPos;
 layout (location = 1) in vec3 inNormal;
 
 layout (location = 0) out vec3 outNormal;
 
-out gl_PerVertex
-{
-	vec4 gl_Position;
-};
-
 void main(void)
 {
 	outNormal = inNormal;

data/shaders/geometryshader/mesh.vert

@@ -18,11 +18,6 @@ layout (location = 1) out vec3 outColor;
 layout (location = 2) out vec3 outViewVec;
 layout (location = 3) out vec3 outLightVec;
 
-out gl_PerVertex
-{
-	vec4 gl_Position;
-};
-
 void main() 
 {
 	outNormal = inNormal;