Remove addition of dependencies for static libraries.

Remove addition of dependencies for static libraries.

The content in the prl file is not compatible with what CMake
expects in the value of the IMPORTED_LINK_INTERFACE_LIBRARIES
property. That property expects a list of IMPORTED targets or
full paths to libraries.

The prl file gives us a whitespace separated string of content
suitable for passing to ld, that is, it contains -L and -l content.
As this would take a lot of error prone parsing in cmake code in
order to resolve the content to a list of full paths to libraries
(which can be processed by any cmake generator), it's better to
remove the code until qmake is able to generate a list of full
paths.

Change-Id: I72fe8e862b7f3bd25a7f9a03db94d2e9b815d08a
Reviewed-by: Brad King <brad.king@kitware.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Clinton Stimpson <clinton@elemtech.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>