X11 wide tilemap support

- support X11 tile files (with or without XPM) that are 40 tiles wide
- rearrange some X11 code to share more code between XPM & non-XPM options
- clean out some deprecated X11/winmap.c #ifdefs
- update Qt code minimally to handle such an XPM file

include/tile2x11.h

@@ -13,6 +13,10 @@ typedef struct {
     unsigned long tile_width;
     unsigned long tile_height;
     unsigned long ntiles;
+    unsigned long per_row;
 } x11_header;
 
+/* how wide each row in the tile file is, in tiles */
+#define TILES_PER_ROW (40)
+
 #endif	/* TILE2X11_H */

include/winX.h

@@ -56,6 +56,8 @@ struct tile_map_info_t {
     unsigned short glyphs[ROWNO][COLNO];	/* Saved glyph numbers. */
     GC	white_gc;
     GC	black_gc;
+    unsigned long image_width;			/* dimensions of tile image */
+    unsigned long image_height;
 };
 
 struct map_info_t {