Fixed more shader compiler errors due to changes in shader library.

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/ImageBasedLighting.hlsl

 // Pre-integration
 // ----------------------------------------------------------------------------
 
+#if !defined SHADER_API_GLES
 // Ref: Listing 18 in "Moving Frostbite to PBR" + https://knarkowicz.wordpress.com/2014/12/27/analytical-dfg-term-for-ibl/
 real4 IntegrateGGXAndDisneyFGD(real3 V, real3 N, real roughness, uint sampleCount = 8192)
 {
 
     return acc;
 }
+#else
+// Not supported due to lack of random library in GLES 2
+ERROR_ON_UNSUPPORTED_FUNCTION(IntegrateGGXAndDisneyFGD)
+#endif
 
 uint GetIBLRuntimeFilterSampleCount(uint mipLevel)
 {

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightShaderLibrary/Lighting.hlsl

 half3 SampleSH(half3 normalWS)
 {
     // LPPV is not supported in Ligthweight Pipeline
-    float4 SHCoefficients[7];
+    real4 SHCoefficients[7];
     SHCoefficients[0] = unity_SHAr;
     SHCoefficients[1] = unity_SHAg;
     SHCoefficients[2] = unity_SHAb;