Eliminate copies in deferred cleanup #249

Job	Run time
pre-job	5m 33s
windows-build-and-test (opengl, legacy)	1h 30m 7s
windows-build-and-test (opengl, drawable)	1h 26m 49s
windows-build-and-test (egl, legacy)	1h 27m 12s
windows-build-and-test (vulkan, drawable)	1h 49m 16s
windows-build-and-test (osmesa, legacy)	1h 32m 16s
windows-build-and-test (osmesa, drawable)	1h 31m 42s
Windows CI Result	1s
	9h 22m 56s

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