Eliminate zstd version checking at runtime

[georgthegreat]

Hi,

we build python-zstandard as a part of our monorepo and we experience the necessity to patch python bindings every time zstd gets updated.
This code checks if the runtime version matches the compile time one:

python-zstandard/c-ext/backend_c.c

Line 155 in 9eb5694

unsigned our_hardcoded_version = 10506;

Is it possible to either remove this check or make it more flexible?