Removed the unused DiffUnlitEnvCube thechnique.

Resources/CoreData/Techniques/DiffUnlitEnvCube.xml

@@ -1,8 +0,0 @@
-<technique vs="LitSolid" ps="LitSolid" psdefines="DIFFMAP" >
-    <pass name="base" vsdefines="ENVCUBEMAP" psdefines="ENVCUBEMAP" />
-    <pass name="prepass" psdefines="PREPASS" />
-    <pass name="material" vsdefines="ENVCUBEMAP" psdefines="MATERIAL ENVCUBEMAP" depthtest="equal" depthwrite="false" />
-    <pass name="deferred" vsdefines="ENVCUBEMAP" psdefines="DEFERRED ENVCUBEMAP" />
-    <pass name="depth" vs="Depth" ps="Depth" />
-    <pass name="shadow" vs="Shadow" ps="Shadow" />
-</technique>