[Bug 221828] bsd.qt.mk: Rework qt-post-install

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221828

            Bug ID: 221828
           Summary: bsd.qt.mk: Rework qt-post-install
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: kde at FreeBSD.org
          Reporter: rakuco at FreeBSD.org

Right now, we use the QT_DEFINES variable to help split a Qt module coming from
a single tarball into multiple ports.

Part of the process is done with the qt-post-install target to use the
definitions from QT_DEFINES to define some Qt macros in qconfig-<portname>.h,
and cause qconfig-modules.h to include it.

Problems I can think of:
* We need to account for changes such as ports r448361, which dropped
QT_DEFINES and QT_DIST. This stopped installing qconfig-webkit.h while not
dropping the corresponding #include's from qconfig-modules.h.
* We end up with multiple duplicated includes in qconfig-modules.h.
* Knowing when to set QT_DEFINES and which values to pass is not intuitive and
is mostly a manual process.

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