Build failure with primitive 0.6.4.0

[snoyberg]

[1 of 1] Compiling Data.Store.Core  ( src/Data/Store/Core.hs, dist/build/Data/Store/Core.o )

src/Data/Store/Core.hs:520:9: error:
    Ambiguous occurrence ‘copyByteArrayToAddr’
    It could refer to either ‘Data.Primitive.ByteArray.copyByteArrayToAddr’,
                             imported from ‘Data.Primitive.ByteArray’ at src/Data/Store/Core.hs:43:1-41
                          or ‘Data.Store.Core.copyByteArrayToAddr’,
                             defined at src/Data/Store/Core.hs:542:1
    |
520 |         copyByteArrayToAddr sourceArr sourceOffset target len
    |         ^

[mgsloan]

Fixed.