Purge XP_PC.

Bug #56767 r=mkaply sr=alecf

configure

@@ -3045,7 +3045,7 @@ else
   echo "$ac_t""no" 1>&6
 fi
 
-for ac_prog in gawk mawk nawk awk
+for ac_prog in mawk gawk nawk awk
 do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2