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

Fri Aug 9 10:31:40 UTC 2024

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.

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Commit messages:
 - 8338108: Give better error message in configure if a full XCode is missing

Changes: https://git.openjdk.org/jdk/pull/20520/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20520&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338108
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20520.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20520/head:pull/20520

PR: https://git.openjdk.org/jdk/pull/20520