[Bug-readline] Correct FreeBSD handling

[Peter Jeremy]

Hi,

FreeBSD migrated from aout to ELF format during release 3 and
objformat(1) was temporarily added to ease the transition.  All
versions of FreeBSD released this millenium have been ELF and
objformat has now been removed.  Unfortunately, the readline
configuration tools assume that not having objformat(1) on FreeBSD
means it's an aout environment - whereas the opposite is now true.

This bug is still present in readline-6.0.  A possible fix is
attached.

-- 
Peter Jeremy

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