Do not download mysql-boost-5.7.44.tar.gz if already present #4438 #64

Job	Run time
cache / lock	7s
cache / builds (centos6)	4m 58s
cache / builds (centos7)	4m 50s
cache / builds (debian11)	6m 11s
cache / builds (fedora37, -clang)	6m 39s
cache / builds (ubuntu22, -clang)	7m 3s
cache / builds (ubuntu22, -tap)	10m 25s
cache / unlock	3s
run / select	2s
run / tests (tests)	1h 26m 43s
run / tests (tests_with_deps/deprecate_eof_support)	12m 53s
	2h 19m 54s

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