Temporarily disable level-zero-event-leak.cpp on Windows (#834)

Author: againull

SYCL/Plugin/level-zero-event-leak.cpp

@@ -1,4 +1,7 @@
 // REQUIRES: level_zero, level_zero_dev_kit
+// TODO: ZE_DEBUG=4 produces no output on Windows. Enable when fixed.
+// UNSUPPORTED: windows
+//
 // RUN: %clangxx -fsycl -fsycl-unnamed-lambda -fsycl-targets=%sycl_triple %level_zero_options %s -o %t.out
 // RUN: env SYCL_DEVICE_FILTER=level_zero ZE_DEBUG=4 %GPU_RUN_PLACEHOLDER %t.out 2>&1 %GPU_CHECK_PLACEHOLDER
 //