Add conflicts to port

[Matthias Fechner]

Am 09.01.2019 um 13:27 schrieb Mathieu Arnold:
> CONFLICTS, CONFLICTS_BUILD and CONFLICTS_INSTALL exist to tell the user
> building the port that the port they are trying to install cannot be
> built-or-installed/build/installed while this other port is installed.

thanks for clarification, I created a PR for this:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234807

and added it as blocker for:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225309

To be consistent pkg should handle packages equal to ports.
Any difference here will only cause problems like this.

Gruß
Matthias

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