8243656: Shell built-in test in configure depends on help

Help might not be available to check for built-ins: Use 'command -v' instead

Reviewed-by: erikj

make/autoconf/util.m4

@@ -573,7 +573,7 @@ AC_DEFUN([UTIL_REQUIRE_BUILTIN_PROGS],
   UTIL_SETUP_TOOL($1, [AC_PATH_PROGS($1, $2, , $3)])
   if test "x[$]$1" = x; then
     AC_MSG_NOTICE([Required tool $2 not found in PATH, checking built-in])
-    if help $2 > /dev/null 2>&1; then
+    if command -v $2 > /dev/null 2>&1; then
       AC_MSG_NOTICE([Found $2 as shell built-in. Using it])
       $1="$2"
     else