gpsd-devel pulls Qt5 devel packages for linking to libQgpsmm.so.

This also means pulling Qt5 when building (what will become) Plasma 6.

In most dependent packages, the library is unneeded.

Preliminary work to split the headers and libraries needing Qt is done in
https://build.opensuse.org/package/show/home:krop:branches:Application:Geo/gpsd

Dependent packages:

From Application:Geo
- foxtrotgps: It doesn't need Qgpsmm but uses %make_jobs, which is incorrect.

- merkaartor: the package split revealed merkaartor it has a dependency on
QtNetwork for 3rdparty/qtsingleapplication-2.6_1-opensource/

- navit: unresolvable in Application:Geo

- viking: builds fine 

From openSUSE:Factory
- collectd: builds fine
- gpredict: builds fine
- ntpsec: builds fine
- ocli: builds fine
- stellarium: needs a BuildRequires: pkgconfig(Qgpsmm)
- uhd: builds fine