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Print dlopen error on stderr #101

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Otherwise a package that happens to try to load opencl to get information (e.g. hwloc-calc) would spuriously emit output that disturbs further processing, e.g.:

$ N=$(hwloc-calc all -N node)
$ echo "$N"
dlerror: libamd_comgr.so.2: cannot open shared object file: No such file or directory 2

Otherwise a package that happens to try to load opencl to get
information (e.g. hwloc-calc) would spuriously emit output that disturbs
further processing, e.g.:

$ N=$(hwloc-calc all -N node)
$ echo "$N"
dlerror: libamd_comgr.so.2: cannot open shared object file: No such file or directory
2
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