(svn r22178) [1.1] -Backport from trunk:

- Fix: [NewGRF] Memory leak if an industry NewGRF had more than one prop A or 15, or a station NewGRF had more than one prop 09 (r22175, r22165)
- Fix: [NewGRF] Disable a station NewGRF when it contains an unterminated spritelayout in action0 prop 08 instead of crashing (r22164)
- Fix: Building a station part adjacent to both an existing station and a rail waypoint failed [FS#4541] (r22163)

src/sprite.cpp

@@ -14,6 +14,8 @@
 #include "viewport_func.h"
 #include "landscape.h"
 #include "spritecache.h"
+#include "core/alloc_func.hpp"
+#include "core/mem_func.hpp"
 
 
 /**
@@ -108,3 +110,17 @@ void DrawCommonTileSeqInGUI(int x, int y, const DrawTileSprites *dts, int32 orig
 		}
 	}
 }
+
+/** Create a copy of an existing DrawTileSeqStruct array. */
+const DrawTileSeqStruct *CopyDrawTileSeqStruct(const DrawTileSeqStruct *dtss)
+{
+	const DrawTileSeqStruct *element;
+
+	size_t count = 1; // 1 for the terminator
+	foreach_draw_tile_seq(element, dtss) count++;
+
+	DrawTileSeqStruct *copy = MallocT<DrawTileSeqStruct>(count);
+	MemCpyT(copy, dtss, count);
+
+	return copy;
+}