[libprofile-qt] Remove YAML files.
[libprofile-qt] Remove old Qt 4 packaging.
[libprofile-qt] Use the correct macro for multi-core builds.
[libprofile-qt] Remove old Qt 4 support.
[libprofile-qt] Use %qmake5_install, not %qmake_install.

This is a (mostly harmless) oversight in this case, but make sure to do it right
to avoid future surprises.
[libprofile-qt] Remove DESTDIR setting.

This breaks installation under Qt 5.3.
Merge pull request #4 from rburchell/master

Fix build with Qt 5.3 (& cleanup some build related bits, remove Qt 4 build support)