Add a patch to fix the build with CMake 3.5.0.

Starting with CMake 3.5.0, overriding CMAKE_{BINARY,SOURCE}_DIR does not
propagate to other files included with add_subdirectories(); in fact, doing so
should in general be avoided.

Add a patch to use PROJECT_{BINARY,SOURCE}_DIR instead, which works with all
CMake versions.

This is also being discussed upstream in
https://github.com/gnuradio/volk/pull/65.

PR: 208033
Obtained from: Fedora Project