compressor: update use of ZSTD_createCDict_advanced
compressor: update use of ZSTD_createCDict_advanced

zstd 1.3.0 added a new argument to define the dictionary mode.

We use, "auto" detection for now, which should be backwards compatible.
indygreg/python-zstandard,indygreg/python-zstandard,indygreg/python-zstandard,indygreg/python-zstandard