Enum constants with class body can't have empty argument list

[Jesper Öqvist]

Extendj 8.0.1

An error in the enum parser makes ExtendJ not allow the following enum declaration:

// Enum constants can have a class body.
// .result=COMPILE_PASS
enum Test {
  MY_CONSTANT() {
    void m() {
    }
  }
}

The parser expects a non-empty argument list and gives a syntax error on the RPAREN ()) token.

[Jesper Öqvist]

Fix enum parsing error

Allow enum constant declarations with a class body to have an empty argument list.

fixes #133 (bitbucket)

→ <<cset 152b130b1726>>