fix pass type guards in code included by custom graph nodes

ShaderLibrary/Nodes_Common/IsForwardPass.hlsl

 
 void IsForwardPass_float(out bool Out)
 {
-#if (SHADERPASS == SHADERPASS_FORWARD) 
+#if defined(SHADERPASS) && (SHADERPASS == SHADERPASS_FORWARD) 
 	Out = true;
 #else
 	Out = false;

ShaderLibrary/Nodes_Common/LoadNormalBuffer.hlsl

 #ifndef __LOADNORMALBUFFER_H__
 #define __LOADNORMALBUFFER_H__
 
-#if (SHADERPASS == SHADERPASS_FORWARD)
+#if defined(SHADERPASS) && (SHADERPASS == SHADERPASS_FORWARD)
 	void LoadNormalBuffer_float(in float2 positionSS, out float3 normalWS, out float smoothness)
 	{
 		NormalData normalData;

ShaderLibrary/Nodes_Teeth/TeethAttenuation.hlsl

 #elif defined(TEETH_DATA_VARIABLE_32)
 	#define SPHERICALPOLYGON_MAX_VERTS 32
 	#define SPHERICALPOLYGON_NUM_VERTS _TeethVertexCount
+#else
+	#define SPHERICALPOLYGON_MAX_VERTS 3
+	#define SPHERICALPOLYGON_NUM_VERTS 3
 #endif
 
 uniform float4 _TeethParams;// x = lit potential min, y = lit potential max