ext/openssl/deprecation.rb: remove broken-apple-openssl

The version bundled with macOS is anyway too old to compile the
extension.

Author: rhenium

ext/openssl/deprecation.rb

@@ -3,9 +3,6 @@ module OpenSSL
   def self.deprecated_warning_flag
     unless flag = (@deprecated_warning_flag ||= nil)
       if try_compile("", flag = "-Werror=deprecated-declarations")
-        if with_config("broken-apple-openssl")
-          flag = "-Wno-deprecated-declarations"
-        end
         $warnflags << " #{flag}"
       else
         flag = ""