Pipeline threads: remove the private memcopy since it's not kept aliv… #916

Job	Run time
Linux.noble.GNU14.skiptest.Debug.Ninja	4m 0s
Linux.noble.GNU14.nofeatures.Debug.Ninja	4m 1s
Linux.noble.GNU14.skiptest.Release.Ninja	4m 1s
Win64.UCRT64.skiptest.Debug.Ninja	10m 32s
Linux.noble.GNU14.nofeatures.Release.Ninja	3m 48s
Win64.UCRT64.nofeatures.Debug.Ninja	10m 15s
Linux.noble.LLVM16.skiptest.Debug.Ninja	4m 1s
Win64.UCRT64.skiptest.Release.Ninja	11m 23s
Linux.noble.LLVM16.nofeatures.Debug.Ninja	3m 44s
Win64.UCRT64.nofeatures.Release.Ninja	10m 30s
Linux.noble.LLVM16.skiptest.Release.Ninja	4m 1s
Linux.noble.LLVM16.nofeatures.Release.Ninja	4m 1s
macOS.${{ matrix.compiler.compiler }}.${{ matrix.build.xcode }}.${{ matrix.target }}.${{ matrix.btype }}.${{ matrix.generator }}	0s
	1h 14m 17s

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