ssl: remove OpenSSL::ExtConfig

This module was introduced in 2015 for internal use within this library. Neither of the two constants in it is used anymore. I don't think we will be adding a new constant in the foreseeable future, either. OPENSSL_NO_SOCK is unused since commit 998d667 (r55191). HAVE_TLSEXT_HOST_NAME is unused since commit 4eb4b32.

Author: rhenium

ext/openssl/ossl_ssl.c

@@ -30,7 +30,6 @@
 } while (0)
 
 VALUE mSSL;
-static VALUE mSSLExtConfig;
 static VALUE eSSLError;
 VALUE cSSLContext;
 VALUE cSSLSocket;
@@ -2588,16 +2587,6 @@ Init_ossl_ssl(void)
  */
  mSSL = rb_define_module_under(mOSSL, "SSL");
 
- /* Document-module: OpenSSL::ExtConfig
- *
- * This module contains configuration information about the SSL extension,
- * for example if socket support is enabled, or the host name TLS extension
- * is enabled. Constants in this module will always be defined, but contain
- * +true+ or +false+ values depending on the configuration of your OpenSSL
- * installation.
- */
- mSSLExtConfig = rb_define_module_under(mOSSL, "ExtConfig");
-
  /* Document-class: OpenSSL::SSL::SSLError
  *
  * Generic error class raised by SSLSocket and SSLContext.
@@ -2760,8 +2749,6 @@ Init_ossl_ssl(void)
  */
  rb_attr(cSSLContext, rb_intern_const("session_remove_cb"), 1, 1, Qfalse);
 
- rb_define_const(mSSLExtConfig, "HAVE_TLSEXT_HOST_NAME", Qtrue);
-
  /*
  * A callback invoked whenever a new handshake is initiated on an
  * established connection. May be used to disable renegotiation entirely.
@@ -2953,10 +2940,8 @@ Init_ossl_ssl(void)
  */
  cSSLSocket = rb_define_class_under(mSSL, "SSLSocket", rb_cObject);
 #ifdef OPENSSL_NO_SOCK
- rb_define_const(mSSLExtConfig, "OPENSSL_NO_SOCK", Qtrue);
  rb_define_method(cSSLSocket, "initialize", rb_f_notimplement, -1);
 #else
- rb_define_const(mSSLExtConfig, "OPENSSL_NO_SOCK", Qfalse);
  rb_define_alloc_func(cSSLSocket, ossl_ssl_s_alloc);
  rb_define_method(cSSLSocket, "initialize", ossl_ssl_initialize, -1);
  rb_undef_method(cSSLSocket, "initialize_copy");