fix zlib conflicts #3268

Job	Run time
Ubuntu / Release / gcc	23m 42s
macOS / Release / homebrew-clang	7m 43s
Ubuntu / Debug / gcc	17m 57s
macOS / Debug / homebrew-clang	6m 16s
Ubuntu / Release / clang	19m 3s
macOS / Release / system-clang	5m 10s
Ubuntu / Debug / clang	13m 37s
macOS / Debug / system-clang	4m 56s
Windows / Release / cl	33m 30s
Windows / Release / clang	34m 18s
Windows / Release / clang-cl	28m 20s
Windows / Debug / cl	17m 2s
Windows / Debug / clang	27m 22s
Windows / Debug / clang-cl	15m 44s
	4h 14m 40s

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