build: use the system provided packages if found #9594

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	13m 3s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	13m 19s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	12m 25s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	12m 35s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	12m 35s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	13m 21s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	12m 41s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	12m 34s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	13m 0s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	12m 47s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	44m 52s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	12m 18s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	12m 17s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	12m 15s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	12m 14s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	12m 22s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	12m 5s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	11m 57s
Unit tests (matrix)	1s
	4h 18m 41s

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