timegm() and other time related functions

[Sebastian Huber]

Hello,

while porting nats.c to RTEMS I noticed that Newlib doesn't provide a 
timegm() function. There a couple of related patches and discussions on 
the Newlib mailing list in the last years.

In order to add support for timegm() I would replace the Newlib time 
function implementation with the version of a more actively maintained 
platform, for example OpenBSD, FreeBSD or bionic. It seems that the 
upstream for the bionic code is OpenBSD. The OpenBSD and FreeBSD code 
diverged a bit, however, FreeBSD seems to integrate changes from OpenBSD 
occasionally. The FreeBSD looks to be closer to the original tzcode and 
uses the pthread API. I tend to use the FreeBSD code. Would that be 
acceptable?

Kind regards,
	Sebastian

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