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Use code:lib_dir/1 to find correct ei dir

Andrew Thompson requested to merge Vagabond1/erlang-rocksdb:adt/fix-find-ei into master

On my system, for some odd reason, I have several erl_interface directories in the erlang lib dir (I think it's the xbps package manager):

_andrew@system76:: ls /usr/lib/erlang/lib/erl_interface*                                                                                                                        
/usr/lib/erlang/lib/erl_interface-3.10.4:
src

/usr/lib/erlang/lib/erl_interface-3.11:
src

/usr/lib/erlang/lib/erl_interface-3.11.2:
src

/usr/lib/erlang/lib/erl_interface-3.13.1:
bin  ebin  include  info  lib  src

This causes the CMake script to fail because it picks the first directory in the list.

Instead, use code:lib_dir/1 to find the active library dir

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