[issue2108] getcontext() is missing on DragonFly x86_64

["Sascha Wildner \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Sascha Wildner <saw@online.de> added the comment:

The original amd64 getcontext() we had in libc assumed it was a syscall.

The i386 version is libc only. So just bringing back the amd64 one we had won't 
work.

Someone will have to write a x86_64 libc only getcontext.S.

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