perf: remove unused r_norefresh functionality

Author: mastercoms

src/engine/gl_rmain.cpp

@@ -326,7 +326,6 @@ class CRender : public IRender
 	float			m_yFOV;
 
 	// timing
-	double		m_frameStartTime;
 	float		m_framerate;
 
 	float		m_zNear;
@@ -377,11 +376,6 @@ void CRender::FrameBegin( void )
 		r_framecount++;
 		R_AnimateLight ();
 		R_PushDlights();
-
-		if (!r_norefresh.GetInt())
-		{
-			m_frameStartTime = Sys_FloatTime ();
-		}
 	}
 
 	UpdateStudioRenderConfig();

src/engine/matsys_interface.cpp

@@ -100,7 +100,6 @@ static CTextureReference g_ResolvedFullFrameDepth;
 void WorldStaticMeshCreate( void );
 void WorldStaticMeshDestroy( void );
 
-ConVar	r_norefresh( "r_norefresh","0");
 ConVar	r_decals( "r_decals", "2048" );
 ConVar	mp_decals( "mp_decals","200", FCVAR_ARCHIVE);
 ConVar	r_lightmap( "r_lightmap", "-1", FCVAR_CHEAT | FCVAR_MATERIAL_SYSTEM_THREAD );