This patch fixes a bug in the Boom dehacked parser that causes it to fail
when changing the same text string twice.  Lookup should be performed
with comparison against the original string being replaced, not against
the current value of the string.

--- d_deh.c	(revision 3967)
+++ d_deh.c	(working copy)
@@ -488,12 +488,13 @@
 typedef struct {
   const char **ppstr;  // doubly indirect pointer to string
   const char *lookup;  // pointer to lookup string name
+  const char *orig;
 } deh_strs;
 
 /* CPhipps - const, static
  *         - removed redundant "Can't XXX in a netgame" strings
  */
-static const deh_strs deh_strlookup[] = {
+static deh_strs deh_strlookup[] = {
   {&s_D_DEVSTR,"D_DEVSTR"},
   {&s_D_CDROM,"D_CDROM"},
   {&s_PRESSKEY,"PRESSKEY"},
@@ -2739,9 +2740,14 @@
   found = false;
   for (i=0;i<deh_numstrlookup;i++)
     {
+      if (deh_strlookup[i].orig == NULL)
+        {
+	  deh_strlookup[i].orig = *deh_strlookup[i].ppstr;
+        }
+
       found = lookfor ?
         //e6y !strnicmp(*deh_strlookup[i].ppstr,lookfor,strlen(lookfor)) :
-        !stricmp(*deh_strlookup[i].ppstr,lookfor) :
+        !stricmp(deh_strlookup[i].orig,lookfor) :
         !stricmp(deh_strlookup[i].lookup,key);
 
       if (found)