[kde-freebsd] Please review my (hopefully) final Qt 5.3.2 commits

[Raphael Kubo da Costa]

Hi everyone (particularly Max and Alberto),

I believe all the work for updating Qt5 to 5.3.2 is done. I've been
committing smaller parts of the required changes for a while now, but
left the big, disruptive changes for the end.

The pending diff was quite big to manually divide into separate commits
for SVN, so I ended up doing them in git for now, and will commit them
in the right order to area51 once someone else looks at and OK's them.

The commits are here:
https://github.com/rakuco/freebsd-ports/commits/qt-5.3.2

Specifically, I'm interested in feedback on 12b281c ("Call qmake from
the root of the ${WRKSRC}") and 2787663 ("bsd.qt.mk: Set QMAKESPEC
instead of QMAKEPATH"). Even after looking at several commits in area51
(such as r8728, r8841 and r10019) it wasn't clear why we were doing so
many weird things with qmake and qtbase's configuration script (like
calling qmake directly in pre-configure and post-configure while passing
-dont-process to the configure script). I believe the explanations to my
changes make sense, but I'd really like you guys to see if I got
everything right since you were doing the Qt5 work before.

In addition to that, I don't think we need to change QMAKE_ARGS with the
contents of QT_CONFIG and QT_DEFINES, but I didn't find a good
explanation for why we were doing that in the first place (r8782), but
at least the Poudriere builds of the qtbase ports without those worked
fine.

Lastly, I'm fairly convinced 7492a2c ("Stop explicitly passing
${LOCALBASE} to the compiler") is the only way to fix ports/194088, but
feedback is also welcome.