games/lwjgl3: unbreak build after udpate zstd to 1.5.6

Unbreak build after udpate zstd to 1.5.6 in b594c775ed2dbae25e509d198c462940f0dc9d5c.
Upstream issue: https://github.com/LWJGL/lwjgl3/issues/968

Reported by: pkg-fallout
Approved by: arrowd (mentor, implicit)