Remove manpages from OLD_FILES

[fernape]

Summary

Remove apm.8 and apmconf.8 from OLD_FILES in the relevant Makefiles.

These pages are now installed unconditionally as per 0a0f7486413c

PR: 257228
Reported by: [e-mail], wosch@
Fixes: 0a0f7486413c - Build manpages for all architectures
MFH: 4 weeks

Test Plan

make delete-old does not try to remove those files.

[imp]

Looks good to me as well

[fernape]

Committed in 8539518055d0

Thanks!