[issue2108] getcontext() is missing on DragonFly x86_64

["Peter Avalos \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Peter Avalos <peter@theshell.com> added the comment:

So a little history:

-On the initial import of amd64/x86_64, the functions existed.
-In July 2006 they were removed in 635872e06f82693646a8d979c423433fa839a656 
because i386 didn't have them and they are marked obsolete.
-Then in January 2007, they were added for i386 in 
e274265043a09fe420ae2182ba74ee43fcfbcbd5.

So that's why they're there for i386 and not x86_64.  The question is, do we 
want them or not?  They are completely removed from IEEE Std 1003.1-2008, but 
there's still 3rd-party software that's using those functions.  My vote is to 
keep them and make them available to x86_64.

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