cue/load: make test OS-independent
cue/load: make test OS-independent

Change-Id: I93614e539aaa4fc14f4f9e114e6c9b921e02a0dc
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/2284
Reviewed-by: Marcel van Lohuizen <a22d082192f3ccf984644a4f482781f4c2d65180@google.com>

cuelang/cue