rename nm and strip to acknm and ackstrip

this is to force invocations of these utils for ack to be
explicitly named such, so in the future binutils can be installed
in /usr/pkg without the g- prefix.

commands/unstack/unstack.sh

@@ -5,12 +5,12 @@ then	echo "Usage: $0 <executable> [0x... [0x... ] ]"
 	exit 1
 fi
 
-PATH=$PATH:/usr/gnu/bin
+PATH=$PATH:/usr/gnu/bin:/usr/pkg/bin
 
 if file $1 | grep NSYM >/dev/null 2>&1; then
   NM="gnm --radix=d"
 else
-  NM="nm -d"
+  NM="acknm -d"
 fi
 
 executable=$1