lint is dead: delete useless LINTLIBRARY comments

ok millert@

All these files include <stdlib.h>, so do not need to cast
malloc/calloc/realloc* returns.

lint is dead (long live the lint!), so stop using it as a cpp conditional
(namespace pollution!) or talking about its opinion on code.

ok krw@

Revert previous diff as it resulted in the wrong return code when
the last node is deleted. Instead, resolve the Coverity warning
by returning (node *)1 when you delete the root node.

based an idea from millert@. ok otto@

When tdelete() is used to delete the root node, don't return a
pointer to the freed root node, but return a pointer to the new
root node. POSIX does not define, what should be returned in
that case.

Fixes Coverity CID 2528.

ok millert@ otto@

ansi + de-register

ok otto deraadt

add some missing $, ok djm@ 'That looks fine to me' millert@

Part one of userland __P removal. Done with a simple regexp with some minor hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.

Include <stdlib.h> for malloc() proto.

PD tsearch as reqd by xpg; by esr