updating connector/c license banner.

connector/c/include/tarantool/tnt.h

connector/c/include/tarantool/tnt_buf.h

connector/c/include/tarantool/tnt_call.h

connector/c/include/tarantool/tnt_delete.h

connector/c/include/tarantool/tnt_enc.h

connector/c/include/tarantool/tnt_insert.h

connector/c/include/tarantool/tnt_io.h

connector/c/include/tarantool/tnt_iob.h

connector/c/include/tarantool/tnt_iter.h

connector/c/include/tarantool/tnt_lex.h

connector/c/include/tarantool/tnt_mem.h

connector/c/include/tarantool/tnt_net.h

connector/c/include/tarantool/tnt_opt.h

connector/c/include/tarantool/tnt_ping.h

connector/c/include/tarantool/tnt_proto.h

connector/c/include/tarantool/tnt_reply.h

connector/c/include/tarantool/tnt_request.h

connector/c/include/tarantool/tnt_rpl.h

connector/c/include/tarantool/tnt_select.h

connector/c/include/tarantool/tnt_sql.h