misc/compat4x: add dependency on compat5x

compat4x requires a bunch of libraries which have been removed in
FreeBSD 6 so present in compat5x:

• libncurses.so.5
• libmd.so.2
• libcryt.so.2
• libradius.so.1
• libssh.so.2
• libcrypto.so.3
• libtacplus.so.1