remove some unnecessary sys/param.h inclusions

Synced atomicio implementation in nc and sendbug with ssh.

OK djm@, joris@, ray@

Remove some unused headers, from Igor Zinovik.

Import public domain rewrite of sendbug, written by Ray Lai. =)
Replaces GNU sendbug/sendpr, the wonderful shell script that had
trouble dealing with signals, behaved differently depending on what
fi

Import public domain rewrite of sendbug, written by Ray Lai. =)
Replaces GNU sendbug/sendpr, the wonderful shell script that had
trouble dealing with signals, behaved differently depending on what
file it read upon startup, and suffered from issues plaguing most
large shell scripts.

OK deraadt@.

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