all: DragonFly port.

Fix compilation problems, libdraw still doesn't work right yet.

LGTM=rsc
R=rsc
https://codereview.appspot.com/67820046

bin/9c

@@ -77,7 +77,7 @@ tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}-${CC9:-cc}"
 case "$tag" in
 *FreeBSD*gcc*)	usegcc ;;
 *FreeBSD*clang*)	useclang ;;
-*BSD*)	usegcc ;;
+*DragonFly*|*BSD*)	usegcc ;;
 *Darwin-x86_64*clang*)
 		useclang
 		cflags="$ngflags -g3 -m64"

bin/9l

@@ -24,7 +24,7 @@ case "$tag" in
 		;;
 	esac
 	;;
-*BSD*)
+*DragonFly*|*BSD*)
 	ld=${CC9:-gcc}
 	userpath=true
 	extralibs="$extralibs -lutil"