Fix for windows default method in mp ctx
Fix for windows default method in mp ctx

seibert/numba,stuartarchibald/numba,numba/numba,numba/numba,numba/numba,gmarkall/numba,stuartarchibald/numba,gmarkall/numba,cpcloud/numba,jriehl/numba,jriehl/numba,IntelLabs/numba,jriehl/numba,seibert/numba,stonebig/numba,stonebig/numba,seibert/numba,stonebig/numba,gmarkall/numba,stuartarchibald/numba,cpcloud/numba,cpcloud/numba,stuartarchibald/numba,seibert/numba,stonebig/numba,cpcloud/numba,IntelLabs/numba,seibert/numba,sklam/numba,sklam/numba,sklam/numba,sklam/numba,sklam/numba,IntelLabs/numba,stonebig/numba,jriehl/numba,gmarkall/numba,jriehl/numba,numba/numba,IntelLabs/numba,IntelLabs/numba,gmarkall/numba,numba/numba,stuartarchibald/numba,cpcloud/numba