Since PyQt 4.10, PyQt.pyqtconfig is deprecated and not available unless
PyQt is built using the old configure script.

PyKDE4 itself has recently been adjusted to mimic PyQt itself and only
install its pykdeconfig module if pyqtconfig is present. Additionally,
information such as SIP flags and the directory where PyKDE's SIP files
are installed are now also provided in the
PyKDE4.kdecore.PYKDE_CONFIGURATION dict.

This commit completely rewrites FindPyKDE4.py to make it look like
FindPyQt.cmake after commit a7e4743: most of the information used by
FindPyKDE4.cmake is fetched from PyKDE4.kdecore, and we first try to
obtain the SIP flags and directory from pykdeconfig and, if it fails, we
use PYKDE_CONFIGURATION.

Furthermore, FindPyKDE4.py now only prints the variables that are
actually consumed by FindPyKDE4.cmake -- it is not possible to obtain
all the data provided by pykdeconfig in PYKDE_CONFIGURATION. We've also
stopped reading and setting PYKDE4_VERSION_TAG, since PyKDE4 stopped
setting a KDE tag in 2008 (and its value was 3_92_0 at the time).

(Forwardport kdelibs 4d29cf8)

sys.prefix should be used instead of sys.platform

Forward port of kdelibs commit 8b1abe25dcf243cd2cdf23dff7272aca921292ae

PYQT4_SIP_DIR is a directory, not a file.

Forwardport of kdelibs/37f31f9ce39569a1096e5a04b6679a91e6ae18fe.

This way, on the Debian versions of these OSes, the library directory
can be a multiarch path.

REVIEW:118020

The version committed in 0912b24 is slightly different from the one in
kdelibs -- besides a few differences in the comments, there is an IF()
check that was always evaluating to false.

REVIEW:119339

This now forwards to the buildsystem mailing list.

Otherwise, if lconvert exists in normal system paths (eg. /usr/bin) that one
will be used instead of the one alongside Qt5::lrelease. This could cause Qt4
lconvert to be incorrectly used on some systems.

REVIEW: 119198