Make fi_verbs backend optional
Only compile the fi_verbs backend if ENABLE_FIVERBS is set to ON in cmake. By default the option is OFF. This allows building by default on systems that do not have an OFED stack installed.
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Only compile the fi_verbs backend if ENABLE_FIVERBS is set to ON in cmake. By default the option is OFF. This allows building by default on systems that do not have an OFED stack installed.