Seth R Johnson 3acbe073ba FindJava: improve failure/verbosity when 'java -version' fails ...

On macOS monterey, `java -version` returns
```
The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.

```
which does not match the existing regex. Instead of hitting a fatal error if required,
reset the variable and let FindPackage handle the result.

If `QUIET` is requested, don't print anything if the version query fails. Otherwise, print the message.

Additionally, clean up temporary variables set by the execute_process commands.

2022-05-31 07:34:49 -04:00

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