Drop unneeded makedepends

The following makedepends are not needed and the package builds fine without them.

I'm not using the package and don't know why there were added, so I'd like others to look at it. Some (vtk, glew, hdf5) are optdepends of opencv so there might be some point that I don't see.

/cc @arojas @felixonmars

added priority3-normal statusunconfirmed labels

assigned to @felixonmars

This was needed because of crappy opencv pkgconfig support makes binaries link to every single opencv library, which means all their dependencies need to be installed unless you link with --as-needed.

Our LDFLAGS include --as-needed, but qmake projects didn't pick system build flags out of the box until I patched Qt to do so some time ago.

TL;DR: these are no longer needed

resolved all threads

merged