Allow installing both port:tbb and port:onetbb

[Kirill A. Korinsky]

Folks,

I'd like to announce the PR on which I've worked for last weeks.

The goal is allow to install both `tbb` and `onetbb` port on the same machine, and it forces to add installing both `oce` and `opencascade`.

It is based on serveral PRs which I've made and which's fixed broken ports:
 - https://github.com/macports/macports-ports/pull/16866
 - https://github.com/macports/macports-ports/pull/16876
 - https://github.com/macports/macports-ports/pull/16888
 - https://github.com/macports/macports-ports/pull/16893
 - https://github.com/macports/macports-ports/pull/16899
 - https://github.com/macports/macports-ports/pull/16912

If someone with write access can review and merge one of dependant ports, I'll be very appreciated.

--
wbr, Kirill

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