MdePkg BaseLib: EXTERNDEF=>EXTERN in X64/SetJump

NASM doesn't support EXTERNDEF, so convert this to EXTERN.

This will make it easier to convert this code to NASM using an
automated script.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
1 file changed