Adjust build system to detect available pmemkv's functions/features

[lukaszstolarczuk]

Right now using current (master) pmemkv-nodejs code we can't compile it with pmemkv's 0.8 version, because we've updated the open() function and it uses new config's class (pmem::kv::config, instead of old C version - pmemkv_config; see pmem/pmemkv#381 for new implementation).
Hence if you want to use master's version of nodejs bindings you have to also use master's version of pmemkv. In future we could check available features of pmemkv and turn them on during the build system in this binding repo.