nacl-sdk: add missing lib32-gcc-libs dependency.
kdevplatform-git, kdevelop-git: call qdbus-qt4 instead of qdbus.

Arch's `qt4` package once added `/usr/lib/qt4/bin` into PATH, but
somehow is not doing it anymore and thus `qdbus` is not available.
Hopefully these patches won't break too often.
kdevelop-git: fixed qt*-doc dependencies.