Merge pull request #435 from Unity-Technologies/Unity-2017.3

Rename ShadowIncludes.inl to ShadowIncludes.hlsl, as .inl extension a…

ScriptableRenderPipeline/Core/ShaderLibrary/Shadow/Shadow.hlsl

-#ifndef SHADOW_HLSL
+#ifndef SHADOW_HLSL
 #define SHADOW_HLSL
 //
 // Shadow master include header.
 
 // Shadow context definition and initialization, i.e. resource binding (project header, must be kept in sync with C# runtime)
 #define SHADOW_CONTEXT_INCLUDE
-#include "../../ShadowIncludes.inl"
+#include "../../ShadowIncludes.hlsl"
 #undef SHADOW_CONTEXT_INCLUDE
 
 // helper function to extract shadowmap data from the ShadowData struct
 
 // include project specific shadow dispatcher. If this file is not empty, it MUST define which default shadows it's overriding
 #define SHADOW_DISPATCH_INCLUDE
-#include "../../ShadowIncludes.inl"
+#include "../../ShadowIncludes.hlsl"
 #undef SHADOW_DISPATCH_INCLUDE
 
 // if shadow dispatch is empty we'll fall back to default shadow sampling implementations