Avoid unneeded use of awk in xzless.

Use "read" instead of "awk" in xzless to get the version
number of "less". The need for awk was introduced in
the commit db5c1817fa.

Thanks to Ariel P for the patch.

src/scripts/xzless.in

@@ -46,8 +46,7 @@ if test "${LESSMETACHARS+set}" != set; then
 	LESSMETACHARS="$space$tab$nl'"';*?"()<>[|&^`#\$%=~'
 fi
 
-less_ver=$(less -V | awk '/^less ([0-9]+)( \(.*\))?$/ { print $2; exit }')
-if test -n "$less_ver" && test "$less_ver" -ge 429; then
+if test "$(less -V | { read less ver re && echo ${ver}; })" -ge 429; then
 	# less 429 or later: LESSOPEN pipe will be used on
 	# standard input if $LESSOPEN begins with |-.
 	LESSOPEN="|-$xz -cdfq -- %s"