common.rb: unused constant

* lib/uri/common.rb (URI::HTML5ASCIIINCOMPAT): remove the constant
  which has been unused since r40460, and wrong since r49069 due
  to the operator precedence.  [ruby-core:86678] [Bug #14711]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63259 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/uri/common.rb

@@ -354,9 +354,6 @@ module URI
   TBLDECWWWCOMP_['+'] = ' '
   TBLDECWWWCOMP_.freeze
 
-  HTML5ASCIIINCOMPAT = defined? Encoding::UTF_7 ? [Encoding::UTF_7, Encoding::UTF_16BE, Encoding::UTF_16LE,
-    Encoding::UTF_32BE, Encoding::UTF_32LE] : [] # :nodoc:
-
   # Encodes given +str+ to URL-encoded form data.
   #
   # This method doesn't convert *, -, ., 0-9, A-Z, _, a-z, but does convert SP