Fixes #583: All wrapper library targets now depend on librt (on Linux… #578

Job	Run time
build (ubuntu-20.04, 12.3.1, 10, bash, Unix Makefiles)	1m 12s
build (ubuntu-20.04, 12.2.2, 10, bash, Unix Makefiles)	1m 9s
build (ubuntu-20.04, 12.1.1, 10, bash, Unix Makefiles)	1m 5s
build (ubuntu-20.04, 12.0.1, 10, bash, Unix Makefiles)	1m 9s
build (ubuntu-20.04, 11.8, 10, bash, Unix Makefiles)	29s
build (ubuntu-20.04, 11.7, 10, bash, Unix Makefiles)	35s
build (ubuntu-20.04, 11.6.2, 10, bash, Unix Makefiles)	28s
build (ubuntu-20.04, 11.6.1, 10, bash, Unix Makefiles)	59s
build (ubuntu-20.04, 11.6, 10, bash, Unix Makefiles)	33s
build (ubuntu-20.04, 11.5, 10, bash, Unix Makefiles)	29s
build (ubuntu-20.04, 11.4, 10, bash, Unix Makefiles)	23s
build (ubuntu-20.04, 11.3, 9, bash, Unix Makefiles)	26s
build (ubuntu-20.04, 11.2, 9, bash, Unix Makefiles)	26s
build (ubuntu-20.04, 11.1, 9, bash, Unix Makefiles)	30s
build (ubuntu-20.04, 11.0, 9, bash, Unix Makefiles)	22s
	10m 15s

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