The monitoring code causes MPI_T based tools to segfault when
monitoring is disabled. This happens because the performance
variables remain registered after the common/monitoring
component is dlclosed due to a missing variable registration
flag. This commit adds the necessary flag to all the registered
performance variables.
The issue on github is #4162. Close when applied to master.
Signed-off-by: Nathan Hjelm <hjelmn@lanl.gov>