Remove accidental definitions of MyMem_*
Remove accidental definitions of MyMem_*

These were guarded to only be defined on Python < 3.4.

This should fix test_snapshot on the 32-bit build.

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