Fix bad syntax when `*/` is prefixed by an opcode.

[isomarcte]

When */ is prefixed by one or more members of scala-syntax:opchar-group ([#:<=>@!%&*+/?\\\\^|~-]), the scala-syntax:propertize-special-symbols function incorrectly marks all the characters as symbol values. This causes the */ not to be recognized as a comment terminator.

This commit corrects the issue by adding an exclusion to the scala-syntax:propertize-special-symbols function if the match value has a suffix of */.

A concrete example can be viewed at https://github.com/scala/scala/blob/v2.11.11/src/reflect/scala/reflect/internal/Symbols.scala#L863 .

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