Fix CFFI test when executed multiple times
Fix CFFI test when executed multiple times

gdementen/numba,shiquanwang/numba,stonebig/numba,GaZ3ll3/numba,ssarangi/numba,stuartarchibald/numba,pitrou/numba,cpcloud/numba,IntelLabs/numba,stefanseefeld/numba,jriehl/numba,pombredanne/numba,sklam/numba,IntelLabs/numba,pitrou/numba,IntelLabs/numba,gmarkall/numba,numba/numba,GaZ3ll3/numba,gdementen/numba,stuartarchibald/numba,numba/numba,pitrou/numba,cpcloud/numba,pitrou/numba,cpcloud/numba,jriehl/numba,gmarkall/numba,shiquanwang/numba,shiquanwang/numba,pitrou/numba,stefanseefeld/numba,sklam/numba,stonebig/numba,IntelLabs/numba,seibert/numba,ssarangi/numba,pombredanne/numba,stuartarchibald/numba,seibert/numba,pombredanne/numba,seibert/numba,gmarkall/numba,pombredanne/numba,GaZ3ll3/numba,stuartarchibald/numba,GaZ3ll3/numba,stefanseefeld/numba,seibert/numba,stonebig/numba,ssarangi/numba,numba/numba,stuartarchibald/numba,stonebig/numba,gmarkall/numba,gdementen/numba,gdementen/numba,stonebig/numba,GaZ3ll3/numba,IntelLabs/numba,numba/numba,pombredanne/numba,cpcloud/numba,jriehl/numba,seibert/numba,stefanseefeld/numba,cpcloud/numba,sklam/numba,gmarkall/numba,gdementen/numba,numba/numba,sklam/numba,ssarangi/numba,stefanseefeld/numba,sklam/numba,ssarangi/numba,jriehl/numba,jriehl/numba