emxomfld doesn't properly allocate space for map file name

[Yuri Dario]

When the output file name doesn't include the extension (this is not required for omf linkers), the map file name space allocation is shorter than needed, so a memory overwriting occurs.

Index: emxomfld.c
===================================================================
--- emxomfld.c	(revision 2508)
+++ emxomfld.c	(working copy)
@@ -1657,8 +1670,13 @@
     map_fname = "nul";
   else if (map_fname == NULL)
     {
-      t = xstrdup (output_fname);
+      //yd output file name can be without extension, need to alloc enough space
+      t = xmalloc (strlen (output_fname) + 1 + 4);
+      strcpy (t, output_fname);
       _remext (t);

[bird]

This was a fix for you own bug in #46 which wasn't committed.