Likely libnosys/libsysbase bug in configure

[bsder]

In the configure file, there are two lines right next to one another after being patched:

ac_unique_file="libnosys"
ac_unique_file="libsysbase"

This is very likely a bug as it *replaces* libnosys as an ac_unique_file yet does not remove libnosys from ac_subdirs_all.

I'm still looking at things, but I at least wanted to get this one out there so that someone with stronger auto-fu than me could explain what the proper fix should be.