lib: Do not use private makefile targets in CMakelists.txt #10226

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	13m 31s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	13m 43s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	13m 5s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	12m 57s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	13m 8s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	13m 56s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	13m 21s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	13m 17s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	13m 26s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	13m 13s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	46m 36s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	12m 56s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	12m 59s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	12m 59s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	12m 51s
run-aarch64-unit-tests	0s
run-macos-unit-tests	0s
run-qemu-ubuntu-unit-tests	0s
Unit tests (matrix)	1s
	3h 51m 59s

Provide feedback