parser rejects abstract functions which return arrays

[Stephen Siegel]

The parser will not accept an abstract function which returns an array, such as

#pragma TASS abstract char[] STDIO_SCAN_STRING(FILE file, int position);

Abstract functions should probably be allowed to take any type and return any type.

[zirkel]

The grammar had been set up for the return type of an abstract function to be a type_name. This prevented arrays, pointers, etc. from being return types of abstract functions. The return type is now any kind of declarator.