[libc] Add x86_64 versions of setjmp() and longjmp()
-rw-r--r-- 558 COPYING
-rw-r--r-- 18092 COPYING.GPLv2
-rw-r--r-- 2931 COPYING.UBDL
-rw-r--r-- 113 README
drwxr-xr-x - contrib
drwxr-xr-x - src