[Bug 235898] Mk/Uses/qt.mk: Complain about components with an unknown suffix instead of silently accepting them

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235898

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tobik
Date: Wed Feb 20 21:24:33 UTC 2019
New revision: 493464
URL: https://svnweb.freebsd.org/changeset/ports/493464

Log:
  Mk/Uses/qt.mk: Complain about components with an unknown suffix

  Normally, USE_QT complains about unknown components with

        ===>  $PKGNAME cannot be installed: unknown USE_QT component
        'foobar'.

  However this fails if the component has a suffix starting with `_`.
  For example

        USE_QT= buildtools_build,core

  or even a simple

        USE_QT= buildtools_buld

  is silently accepted, but they do not do anything.  Only components
  with _build and _run suffixes should be accepted.

  Amend the regular expression we use for this to be stricter.  It
  is currently over eager.  Since we only have two cases to cover
  here we can spell them out explictly instead.

  PR:           235898
  Approved by:  kde (tcberner)
  Differential Revision:        https://reviews.freebsd.org/D19267

Changes:
  head/Mk/Uses/qt.mk

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