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

[Severin Gehwolf]

Hi,

Could I please get a review of this trivial change? Apparently using
the help builtin for determining whether or not a builtin is available
is not a good idea. A more portable way to do this is to use "command
-v" or "type". Thanks to Michael Zucchi for contributing this fix.

Bug: https://bugs.openjdk.java.net/browse/JDK-8243656
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8243656/02/webrev/

Testing: Local builds. jdk/submit.

Thoughts?

Thanks,
Severin