bugfix: change linker flag option for mac builds of charm4py #104

Job	Run time
charm4py_netlrts-linux-x86_64_tcp	7m 5s
buildold_netlrts-linux-x86_64	18m 8s
changa_netlrts-linux-x86_64	6m 25s
cuda_netlrts-linux-x86_64_buildonly	10m 28s
multicore-darwin-x86_64_projections	26m 37s
doc	47s
mpi-linux-x86_64	52m 0s
mpi-linux-x86_64_syncft	12m 42s
netlrts-darwin-x86_64	36m 58s
namd_netlrts-linux-x86_64	9m 3s
netlrts-linux-i386	17m 20s
netlrts-linux-x86_64	15m 51s
netlrts-linux-x86_64_smp	25m 47s
netlrts-linux-x86_64_syncft	11m 12s
netlrts-win-x86_64_mingw64	17m 59s
shellcheck	5s
spack_ubuntu-latest	33m 8s
ucx-linux-x86_64_openpmix	17m 1s
spack_macos-12	38m 22s
verbs-linux-x86_64_smp	16m 7s
	6h 13m 5s

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