Add missing include for `free` (#3920) #660

Job	Run time
Ubuntu Build release	14m 39s
Ubuntu Build debug	15m 50s
Ubuntu Build asan	50m 36s
Ubuntu Build msan	1h 18m 3s
Ubuntu Build tsan	1h 3m 8s
Ubuntu Build scalar	15m 33s
Ubuntu Build lowprecision	14m 14s
Ubuntu Build coverage	2h 27m 47s
Ubuntu Build release-nojpeg	14m 14s
Ubuntu Build release-lcms2	14m 1s
Ubuntu Build release-system-lcms2	14m 5s
Ubuntu Build release:minimal	14m 5s
Ubuntu Build release:gcc8	13m 19s
Ubuntu Build release:clang-7	14m 31s
MacOS Build release:osx	13m 10s
	8h 17m 15s

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