testing: Update ref output for OptiX execution order variance (#1816)

Was spuriously failing tests only because on GPU, the points
didn't always execute in the same order.

Signed-off-by: Larry Gritz <lg@larrygritz.com>

testsuite/array-copy/ref/out-alt.txt

@@ -0,0 +1,18 @@
+Compiled test.osl -> test.oso
+farray3=[-5,-6,5]
+farray3=[-5,-6,5]
+farray3=[-5,-6,5]
+farray3=[-5,-6,5]
+farray3=[-5,-6,5]
+farray3=[-5,-6,5]
+farray3=[-5,-6,5]
+farray3=[-5,-6,5]
+farray3=[7,9,5]
+farray3=[7,9,5]
+farray3=[7,9,5]
+farray3=[7,9,5]
+farray3=[-5,-3,5]
+farray3=[-5,-3,5]
+farray3=[-5,-3,5]
+farray3=[8,10,6]
+