Add conditional compilation facilities to ficl. This had been previously

committed to RELENG_3 instead of HEAD, so let's HEAD catch up.

PR:		bin/9662

sys/boot/ficl/softwords/softcore.fr

@@ -78,6 +78,38 @@ decimal 32 constant bl
     loop drop
 ;
 
+\ ** Some TOOLS EXT words, straight from the standard
+: [else]  ( -- )
+    1 begin                               \ level
+      begin
+        bl word count  dup  while         \ level adr len
+        2dup  s" [IF]"  compare 0= >r
+	2dup  s" [if]"  compare 0= r> or
+        if                                \ level adr len
+          2drop 1+                        \ level'
+        else                              \ level adr len
+          2dup  s" [ELSE]" compare 0= >r
+	  2dup  s" [else]" compare 0= r> or
+	  if				  \ level adr len
+             2drop 1- dup if 1+ then      \ level'
+          else                            \ level adr len
+	    2dup
+            s" [THEN]"  compare 0= >r	  \ level adr len
+	    s" [then]"  compare 0= r> or
+	    if				  \ level
+              1-                          \ level'
+            then
+          then
+        then ?dup 0=  if exit then        \ level'
+      repeat  2drop                       \ level
+    refill 0= until                       \ level
+    drop
+;  immediate
+
+: [if]  ( flag -- )
+0= if postpone [else] then ;  immediate
+
+: [then]  ( -- )  ;  immediate
 \ ** SEARCH+EXT words and ficl helpers
 \ 
 : wordlist   ( -- )