RFR: 8212004: Optional compile_commands.json field not compatible with older libclang

[Robin Westberg]

Hi all,

Please review this small change to remove the “output” field from the compile_commands.json file generated by “make compile-commands”. As it turns out, this optional field is incompatible with tooling built on libclang versions older than 4.0. As this field provides no real benefit for us, it can simply be dropped from the output.

Issue: https://bugs.openjdk.java.net/browse/JDK-8212004
Webrev: https://cr.openjdk.java.net/~rwestberg/8212004/webrev.00/
Testing: tier1, builds-tier5

Best regards,
Robin