We're installing header file pcuif_proto.h so it's better to use
pkg-config for proper version tracking similar to the way it's done for
OpenBSC.
Change-Id: I0520045e5655794df152b98b9755d7cbbd334049
Following 68fc12775f
'Install the pcuif_proto.h header file'
we need to add pcuif_proto.h to the debian install file.
Change-Id: Ib8e185900826baadcc96fcde1491903dbaf85f8b