OGL: Remove support for NV_depth_buffer_float.

We can't clamp the depth values to the 24-bit range while this extension is active.

Source/Core/VideoBackends/OGL/main.cpp

@@ -109,7 +109,6 @@ void VideoBackend::InitBackendInfo()
   g_Config.backend_info.bSupportsInternalResolutionFrameDumps = true;
 
   // Overwritten in Render.cpp later
-  g_Config.backend_info.bSupportsOversizedDepthRanges = false;
   g_Config.backend_info.bSupportsDualSourceBlend = true;
   g_Config.backend_info.bSupportsPrimitiveRestart = true;
   g_Config.backend_info.bSupportsPaletteConversion = true;