Upgrade Snappy to 1.2.1

[big-r81]

No description provided.

[dch]

FWIW I can't compile this at all on my ❄️ ☔ FreeBSD 15.0-CURRENT amd64 with OTP25/26/27. There's that annoying erl_interface error during linking:

dch@wintermute /p/c/snappy> rebar compile
==> snappy (compile)
Compiled src/snappy.erl
Compiling c_src/snappy_nif.cc
Compiling c_src/snappy/snappy-sinksource.cc
Compiling c_src/snappy/snappy-stubs-internal.cc
Compiling c_src/snappy/snappy.cc
ld: error: unable to find library -lerl_interface
cc: error: linker command failed with exit code 1 (use -v to see invocation)
ERROR: sh(cc c_src/snappy_nif.o c_src/snappy/snappy-sinksource.o c_src/snappy/snappy-stubs-internal.o c_src/snappy/snappy.o  -lstdc++ -shared  -L"/usr/local/lib/erlang27/lib/erl_interface-5.5.2/lib" -lerl_interface -lei -o priv/snappy_nif.so)
failed with return code 1 and the following output:
ld: error: unable to find library -lerl_interface
cc: error: linker command failed with exit code 1 (use -v to see invocation)

AFAICT its superfluous since a while, but I can't see where it is coming from.

https://github.com/skunkwerks/snappy-erlang-nif/tree/feature/snappy-1.2.1 has your c_src/snappy and uses rebar3 + davisp's enc.

[big-r81]

Do you use rebar2 or rebar3? In the Makefile, we use rebar2 in CouchDB.