Prefer version of lz4 with simpler build

[lucafavatella]

... thanks to rebar3 pc plugin rather than custom makefile.

I also requested upstream when a new tag will be released though I am not sure whether and when that will happen.

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Attempting to compile locally project including this as a dependency, I got error hence this PR.

cc .../_build/default/lib/lz4/c_src/lz4hc.o .../_build/default/lib/lz4/c_src/lz4_nif.o .../_build/default/lib/lz4/c_src/lz4.o -L /Users/.../homebrew/opt/libsodium/lib -shared -L /Users/.../kerl/installations/OTP-20.3.8.20/lib/erl_interface-3.10.2.1/lib -lerl_interface -lei -o .../_build/default/lib/lz4/c_src/../priv/lz4.so
Undefined symbols for architecture x86_64:
  "_enif_alloc_binary", referenced from:
      _nif_compress in lz4_nif.o
      _nif_uncompress in lz4_nif.o

[lucafavatella]

I started running the tests (./rebar3 as test do cover --reset, eunit --cover, ct --cover, cover --verbose) though I had to abort that for now as it is taking a while. eunit tests passed, ct tests were passing when I interrupted them:

%%% appdefined_SUITE: .
%%% basic_SUITE: ....

I may be able to complete running the tests in the following days.

[lucafavatella]

I noticed some issues on Windows, let me test this more.