Remove: NO_DEBUG_MESSAGES was only read and setting it broke compilation (#6703)

Given any speed issue cannot be attributed to checking for _debug_NNN_level, removing this is a safe action

This fixes #6652.

src/pathfinder/npf/npf.cpp

@@ -275,7 +275,6 @@ static uint NPFReservedTrackCost(AyStarNode *current)
  */
 static void NPFMarkTile(TileIndex tile)
 {
-#ifndef NO_DEBUG_MESSAGES
 	if (_debug_npf_level < 1 || _networking) return;
 	switch (GetTileType(tile)) {
 		case MP_RAILWAY:
@@ -296,7 +295,6 @@ static void NPFMarkTile(TileIndex tile)
 		default:
 			break;
 	}
-#endif
 }
 
 static int32 NPFWaterPathCost(AyStar *as, AyStarNode *current, OpenListNode *parent)

src/pathfinder/yapf/yapf_base.hpp

@@ -122,10 +122,8 @@ public:
 	{
 		m_veh = v;
 
-#ifndef NO_DEBUG_MESSAGES
 		CPerformanceTimer perf;
 		perf.Start();
-#endif /* !NO_DEBUG_MESSAGES */
 
 		Yapf().PfSetStartupNodes();
 		bool bDestFound = true;
@@ -154,7 +152,6 @@ public:
 
 		bDestFound &= (m_pBestDestNode != NULL);
 
-#ifndef NO_DEBUG_MESSAGES
 		perf.Stop();
 		if (_debug_yapf_level >= 2) {
 			int t = perf.Get(1000000);
@@ -174,7 +171,6 @@ public:
 				);
 			}
 		}
-#endif /* !NO_DEBUG_MESSAGES */
 		return bDestFound;
 	}