Enabled shader clip distance feature (validation)

Regenerated shaders with current glslang compiler

data/shaders/offscreen/mirror.vert

@@ -12,11 +12,6 @@ layout (binding = 0) uniform UBO
 layout (location = 0) out vec2 outUV;
 layout (location = 1) out vec4 outPos;
 
-out gl_PerVertex
-{
-	vec4 gl_Position;
-};
-
 void main() 
 {
 	outUV = inUV;

data/shaders/offscreen/phong.vert

@@ -16,12 +16,6 @@ layout (location = 1) out vec3 outColor;
 layout (location = 2) out vec3 outEyePos;
 layout (location = 3) out vec3 outLightVec;
 
-out gl_PerVertex
-{
-	vec4 gl_Position;
-	float gl_ClipDistance[];
-};
-
 void main() 
 {
 	outNormal = inNormal;

data/shaders/offscreen/quad.vert

@@ -11,11 +11,6 @@ layout (binding = 0) uniform UBO
 
 layout (location = 0) out vec2 outUV;
 
-out gl_PerVertex
-{
-	vec4 gl_Position;
-};
-
 void main() 
 {
 	outUV = inUV;