fix: check the QNX example gate via platform.system()

QNX is an operating system rather than a machine architecture, so checking platform.machine() can miss the requirement_not_met() path on QNX hosts. Use platform.system() so the example is waived consistently on that platform.

Made-with: Cursor

Author: rwgk

cuda_bindings/examples/3_CUDA_Features/global_to_shmem_async_copy.py

@@ -1142,7 +1142,7 @@ def matrix_multiply(dims_a, dims_b, kernel_number):
 def main():
     check_compute_capability_too_low(find_cuda_device(), (7, 0))
 
-    if platform.machine() == "qnx":
+    if platform.system() == "QNX":
         requirement_not_met("globalToShmemAsyncCopy is not supported on QNX")
 
     version = check_cuda_errors(cuda.cuDriverGetVersion())