Merge pull request #279 from keijiro/fix-hdrp-unlit

Fix: IsGammaSpace is undefined in the HD Unlit subshader

com.unity.shadergraph/Editor/Templates/HDUnlitPassForward.template

     #include "HDRP/ShaderVariables.hlsl"
     #include "HDRP/ShaderPass/FragInputs.hlsl"
     #include "HDRP/ShaderPass/ShaderPass.cs.hlsl"
+    #include "ShaderGraphLibrary/Functions.hlsl"
 
     ${Defines}