[MacPorts] #68408: Latest commits to mpbb have broken CI

[MacPorts]

#68408: Latest commits to mpbb have broken CI
---------------------------+----------------------
 Reporter:  barracuda156   |      Owner:  jmroot
     Type:  defect         |     Status:  assigned
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:  2.8.1
 Keywords:                 |       Port:
---------------------------+----------------------
 Either
 [https://github.com/macports/mpbb/commit/c48853e678871e580dca89232e52a6d965a31812
 this] or neighboring ones.
 We got all sorts of random failures for existing ports which built fine
 earlier and still build fine locally (not just for me, but for others
 too).

 So far it is either alleged dependency cycle (which may involve test
 dependencies which are now, apparently, confused for build/lib
 dependencies) or activation failure.

 {{{
 Activating all dependencies...
 invalid command name ""
     while executing
 "$workername eval {validate_macportsuser}"
     (procedure "mportexec" line 5)
     invoked from within
 "mportexec $ditem activate"
 Error: Activate failed: invalid command name ""
 Activation of dependency 'gcc12-libcxx' with variants '+clang14' failed,
 aborting.
 Processing dependencies for 'R-ic.infer' failed, aborting.
 }}}

 {{{
 Error: The following dependencies were not installed because all of them
 have unmet dependencies (likely due to a dependency cycle): libiconv
 Build of dependency 'libtextstyle' with variants '' failed, aborting.
 }}}

 Multiple examples here: https://github.com/macports/macports-
 ports/pull/20736 (where ports which are known to build fine, now failed on
 CI)
 Likely related too: https://github.com/macports/macports-ports/pull/20702
 (this one involves changes to R PG, so may or may not be caused by mpbb,
 but I think it is)

-- 
Ticket URL: <https://trac.macports.org/ticket/68408>
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