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XClib - fix to acc_atomic bug in NVHPC <=21.5

Fabrizio Ferrari requested to merge fabrizio22/q-e:acc_atomic_fix into develop

The recent mods in XClib for the detection of errors inside GPU regions have brought out a bug related to the atomic construct in hpc_sdk v21.5 and older. The removal of the explicit acc copy of the variable to be atomically updated seems to be an effective workaround.
I will remove the 'Draft' after a few more checks.

Edited by Ye Luo

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