patch 9.1.1678: Amiga: cannot handle large undo files

Problem:  Amiga: cannot handle large undo files
Solution: Remove the existing restriction as it was only valid for
          classic Amiga (Damien Lejay).

It seems that this block was only relevant for classic AmigaOS (< 32K
alloc limit). And it seems to no longer apply: AmigaOS 4.0 switched to
a slab allocator memory system.

closes: #18072

Signed-off-by: Damien Lejay <damien@lejay.be>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/undo.c

@@ -687,15 +687,6 @@ u_savecommon(
 	u_getbot();
     }
 
-#if !defined(UNIX) && !defined(MSWIN)
-	/*
-	 * With Amiga we can't handle big undo's, because
-	 * then u_alloc_line would have to allocate a block larger than 32K
-	 */
-    if (size >= 8000)
-	goto nomem;
-#endif
-
     /*
      * add lines in front of entry list
      */

src/version.c

@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1678,
 /**/
     1677,
 /**/