RFR: 8338108: Give better error message in configure if a full XCode is missing

[Julian Waters]

On Fri, 9 Aug 2024 10:27:25 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> The XCode command lines tools is almost, but not quite, enough to build the JDK. We still need the metal and metallib tools. The error message given by configure should be improved to indicate if this is the problem with the user's environment.

Looks good! And great to have you back from vacation too :)

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Marked as reviewed by jwaters (Committer).

PR Review: https://git.openjdk.org/jdk/pull/20520#pullrequestreview-2230250307