Stop building GLExtensions.cpp twice(One in GL, one in software). We don't need to build it twice, this'll save a bit of time in the build process.

Also a bit of spacing cleanup.

Source/Core/VideoBackends/OGL/CMakeLists.txt

@@ -1,18 +1,18 @@
-set(SRCS	GLExtensions/GLExtensions.cpp
-			FramebufferManager.cpp
-			GLUtil.cpp
-			main.cpp
-			NativeVertexFormat.cpp
-			PerfQuery.cpp
-			PostProcessing.cpp
-			ProgramShaderCache.cpp
-			RasterFont.cpp
-			Render.cpp
-			SamplerCache.cpp
-			StreamBuffer.cpp
-			TextureCache.cpp
-			TextureConverter.cpp
-			VertexManager.cpp)
+set(SRCS GLExtensions/GLExtensions.cpp
+	   FramebufferManager.cpp
+	   GLUtil.cpp
+	   main.cpp
+	   NativeVertexFormat.cpp
+	   PerfQuery.cpp
+	   PostProcessing.cpp
+	   ProgramShaderCache.cpp
+	   RasterFont.cpp
+	   Render.cpp
+	   SamplerCache.cpp
+	   StreamBuffer.cpp
+	   TextureCache.cpp
+	   TextureConverter.cpp
+	   VertexManager.cpp)
 
 set(LIBS	videocommon
 			SOIL