[orbitcpp-list] idl parser fix

[Andreas K. <ak...@ix...>]

Hi everyone,

current libIDL (as of ORBit 0.5.1) barfs on "const long u = 1-1;", which
is caused by the lexer gobbling up the minus to result in "1" "-1" both
parsed as integer constants. removing the "-" form the lexer defs fixes
this, as done in the enclosed patch.

cya
andy