lsb-build-qt does not build with 5.0

[Jeff Johnson]

To fix a different issue, we now do weekly rebuilds with LSBCC_LSBVERSION set
to 5.0. This has caused a build failure in lsb-build-qt:

lsbc++ -c -o qfsfileengine_unix.o -pipe -DQT_LSB -fpermissive
-DQMAKE_OPENSOURCE_EDITION -I. -Igenerators -Igenerators/unix
-Igenerators/win32 -Igenerators/mac
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/src/corelib/arch/generic
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/include
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/include/QtCore
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/include
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/include/QtCore
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/src/corelib/global
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/src/3rdparty/md5
-DQT_NO_TEXTCODEC -DQT_NO_UNICODETABLES -DQT_NO_COMPONENT -DQT_NO_STL
-DQT_BUILD_QMAKE -DQT_NO_COMPRESS
-I/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/mkspecs/linux-lsb
-DHAVE_QCONFIG_CPP -DQT_NO_THREAD -DQT_NO_QOBJECT -DQT_NO_GEOM_VARIANT
/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/src/corelib/io/qfsfileengine_unix.cpp
/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/src/corelib/io/qfsfileengine_unix.cpp:
In member function 'virtual QStringList QFSFileEngine::entryList(QDir::Filters,
const QStringList&) const':
/opt/buildbot/tmp/rpm-build/BUILD/lsb-build-qt4-4.81.2/qt-x11-opensource-src-4.2.3/src/corelib/io/qfsfileengine_unix.cpp:178:40:
error: 'MAXNAMLEN' was not declared in this scope
gmake[1]: *** [qfsfileengine_unix.o] Error 1

Builds succeed when built with the defaults (which is currently done with a
stable SDK in 4.1 mode), but that will change when the 5.0 SDK goes live.