deb: Add cephfs.pc to libcephfs-dev

Signed-off-by: Anoop C S <anoopcs@cryptolab.net>

Author: anoopcs9

debian/libcephfs-dev.install

@@ -4,3 +4,4 @@ usr/include/cephfs/types.h
 usr/include/cephfs/metrics/Types.h
 usr/lib/libcephfs.so
 usr/lib/libcephfs_proxy.so
+usr/lib/pkgconfig/cephfs.pc