charmc: do not use pipes. They hide exit codes #25

Job	Run time
buildold_netlrts-linux-x86_64	18m 24s
changa_netlrts-linux-x86_64	1m 14s
cuda_netlrts-linux-x86_64_buildonly	9m 56s
charm4py_netlrts-linux-x86_64_tcp	4m 37s
doc	43s
mpi-linux-x86_64	1h 0m 16s
mpi-linux-x86_64_syncft	13m 1s
multicore-darwin-x86_64_projections	3m 44s
namd_netlrts-linux-x86_64	6s
netlrts-darwin-x86_64	25m 36s
netlrts-linux-i386	2m 56s
netlrts-linux-x86_64	15m 30s
netlrts-linux-x86_64_smp	23m 3s
netlrts-linux-x86_64_syncft	11m 17s
netlrts-win-x86_64_mingw64	18m 14s
shellcheck	7s
spack_ubuntu-latest	33m 35s
ucx-linux-x86_64_openpmix	16m 48s
verbs-linux-x86_64_smp	2m 2s
spack_macos-latest	28m 40s
	4h 49m 49s

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