Basically all termios+termcap pgms needs it.
It set ospeed variable using nearest-matched stty speeds,
which helps termcap pgms works with non-fixed termios speeds
and not duplicate ospeed switch into every pgm.
Also it isn't standard function, its source code is too big to include it
in whole to every termcap+termios pgm.
1) Eliminate spaces and double ':'.
2) Remove duplicated capabilities from tc= expansion.
It is needed to not overflow historycal 1024 limit.
Add range check and return -1 if entry is too big instead
of corrupting user memory.
Change the reference for the libtermcap libtermlib link from SHLIBDIR
to LIBDIR. SHLIBDIR is undefined in the standard case.
termcap.c:
Initialize a local variable to zero. Otherwise an erroneous free call
can happen and clobber the calling program.
Seen with vi and gdb. If you have TERMCAP set with a terminal entry and
set TERM with something like huhu, vi and gdb core dumps.
on terminals with no pad char (cons25) and quote from tputs.c says so too:
! * Too bad there are no user program accessible programmed delays.
! * Transmitting pad characters slows many
! * terminals down and also loads the system.
