debian: Remove debian/*.symbols file (#2177)

Symbols file are meant to be used by distribution maintainers and
it is rather useless for upstream repository.

debian/libshadowsocks-libev2.symbols

@@ -1,119 +0,0 @@
-libshadowsocks-libev.so.2 libshadowsocks-libev2 #MINVER#
- ERROR@Base 2.4.7
- FATAL@Base 2.4.7
- accept_rule_arg@Base 2.5.6
- acl_add_ip@Base 2.4.8
- acl_match_host@Base 2.5.6
- acl_remove_ip@Base 2.4.7
- add_rule@Base 2.5.6
- aead_ctx_init@Base 3.0.2
- aead_ctx_release@Base 3.0.2
- aead_decrypt@Base 3.0.2
- aead_decrypt_all@Base 3.0.2
- aead_encrypt@Base 3.0.2
- aead_encrypt_all@Base 3.0.2
- aead_get_cipher_type@Base 3.0.2
- aead_init@Base 3.0.2
- aead_key_init@Base 3.0.2
- balloc@Base 2.4.7
- base64_decode@Base 3.0.2
- base64_encode@Base 3.0.2
- bfree@Base 2.4.7
- bind_to_address@Base 2.4.7
- bprepend@Base 3.0.2
- brealloc@Base 2.4.7
- cache_clear@Base 2.5.6
- cache_create@Base 2.4.7
- cache_delete@Base 2.4.7
- cache_insert@Base 2.4.7
- cache_key_exist@Base 2.4.7
- cache_lookup@Base 2.4.7
- cache_remove@Base 2.4.7
- check_block_list@Base 2.5.6
- cipher_ctx_set_nonce@Base 3.0.2
- cipher_key_size@Base 2.4.8
- cipher_nonce_size@Base 3.0.2
- clear_block_list@Base 2.5.6
- create_remote_socket@Base 2.4.7
- create_server_socket@Base 2.4.7
- crypto_derive_key@Base 3.0.2
- crypto_hkdf@Base 3.0.2
- crypto_hkdf_expand@Base 3.0.2
- crypto_hkdf_extract@Base 3.0.2
- crypto_init@Base 3.0.2
- crypto_md5@Base 3.0.2
- crypto_parse_key@Base 3.0.2
- daemonize@Base 2.4.7
- free_acl@Base 2.4.7
- free_addr@Base 2.4.7
- free_block_list@Base 2.6.3
- free_cb@Base 2.4.7
- free_rules@Base 2.5.6
- free_udprelay@Base 2.4.7
- get_acl_mode@Base 2.5.6
- get_local_port@Base 2.6.3
- get_sockaddr@Base 2.4.7
- get_sockaddr_len@Base 2.4.7
- http_protocol@Base 2.5.6
- init_acl@Base 2.4.7
- init_block_list@Base 2.5.6
- init_rule@Base 2.5.6
- init_udprelay@Base 2.4.7
- is_plugin_running@Base 2.6.3
- json_parse@Base 2.4.7
- json_parse_ex@Base 2.4.7
- json_value_free@Base 2.4.7
- json_value_free_ex@Base 2.4.7
- json_value_none@Base 2.4.7
- keep_resolving@Base 2.4.7
- logfile@Base 2.4.7
- lookup_rule@Base 2.5.6
- new_rule@Base 2.5.6
- new_server_ctx@Base 2.4.7
- outbound_block_match_host@Base 2.5.6
- parse_addr@Base 2.4.7
- plugin_log@Base 2.6.3
- ppbloom_add@Base 3.0.5
- ppbloom_check@Base 3.0.5
- ppbloom_free@Base 3.0.5
- ppbloom_init@Base 3.0.5
- rand_bytes@Base 2.4.7
- read_jconf@Base 2.4.7
- remove_from_block_list@Base 2.5.6
- remove_rule@Base 2.5.6
- reuse_port@Base 3.0.2
- run_as@Base 2.4.7
- set_nofile@Base 2.4.7
- set_reuseport@Base 2.4.7
- (arch=!hurd-i386 !kfreebsd-amd64 !kfreebsd-i386)setinterface@Base 2.4.7
- setnonblocking@Base 2.4.7
- sockaddr_cmp@Base 2.4.7
- sockaddr_cmp_addr@Base 2.4.7
- ss_align@Base 3.0.2
- ss_isnumeric@Base 2.6.3
- ss_itoa@Base 2.4.7
- ss_malloc@Base 2.4.7
- ss_realloc@Base 2.4.7
- ss_strndup@Base 2.4.7
- start_plugin@Base 2.6.3
- start_ss_local_server@Base 2.4.7
- stop_plugin@Base 2.6.3
- stream_cipher_ctx_init@Base 3.0.2
- stream_ctx_init@Base 3.0.2
- stream_ctx_release@Base 3.0.2
- stream_decrypt@Base 3.0.2
- stream_decrypt_all@Base 3.0.2
- stream_encrypt@Base 3.0.2
- stream_encrypt_all@Base 3.0.2
- stream_get_cipher_type@Base 3.0.2
- stream_init@Base 3.0.2
- stream_key_init@Base 3.0.2
- supported_aead_ciphers@Base 3.0.2
- supported_stream_ciphers@Base 3.0.2
- tls_protocol@Base 2.5.6
- trimwhitespace@Base 2.5.6
- update_block_list@Base 2.6.3
- usage@Base 2.4.7
- use_tty@Base 2.4.7
- validate_hostname@Base 2.5.6
- verbose@Base 2.4.7