RFR: 8325626: Allow selection of non-matching configurations using CONF=!string

[Julian Waters]

On Mon, 12 Feb 2024 11:44:46 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> A common scenario is for a developer to have two configurations, a product and a debug version, e.g. `linux-x64`and `linux-x64-debug`. To select the latter using `CONF` is just a matter of using `CONF=debug`, but to select the former, the complete name needs to be supplied: `CONF=linux-x64`.
> 
> Instead, this patch introduces the use of `!` as a negation character, so `CONF=!debug` would select all configurations that do not match `debug`. 
> 
> I also took the time to clarify and correct the documentation on how to use `CONF`.

Marked as reviewed by jwaters (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/17804#pullrequestreview-1875552891