Python 3.7 compat: Account for exc state struct changes
Python 3.7 compat: Account for exc state struct changes

Ref: https://github.com/python/cpython/commit/ae3087c6382011c47db82fea4d05f8bbf514265d

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