Do not install plugins in CMAKE_INSTALL_LIBDIR #1534

Job	Run time
key4hep (/cvmfs/sw-nightlies.hsf.org/key4hep/)	29m 5s
default (LCG_101/x86_64-centos7-gcc11-opt)	23m 55s
default (LCG_102/x86_64-centos9-gcc11-opt)	24m 40s
Upload Event Payload	7s
default (LCG_104/x86_64-el9-gcc13-opt)	1h 7m 10s
default (LCG_105/x86_64-ubuntu2204-gcc11-opt)	1h 3m 56s
non-shared (LCG_105/x86_64-centos7-gcc11-opt)	12m 12s
default (dev3/x86_64-el9-gcc13-opt)	16m 1s
g4units (dev3/x86_64-el9-gcc13-opt)	15m 37s
default (dev3/x86_64-el9-clang16-opt)	15m 42s
default (dev4/x86_64-el9-gcc13-opt)	14m 20s
	4h 42m 45s

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