[antlr-interest] Bug fix for C runtime

[Jim Idle]

Please note that the following two errors in the C runtime:

1) The token text information of imaginary nodes is lost in 3.1.2. Not 
sure how

it works in 3.1.1, but the reason for why it doesn't in 3.1.2 is that 
the the
token's strFactory isn't set up.

2) Attempted to use PUSHSTREAM to implement include file mechanism, but 
failed.
The reason is that the token factory's setInputStream isn't set up properly.

Were introduced by accident in release 3.1.2 and are now fixed in 
release 3.1.3 (coming soon I hope)

Thanks