Running cat program fails with `call to 'fclose' is ambiguous`

[sigmaSd]

Running cat program fails with call to 'fclose' is ambiguous

The problem is that

• in codgen an extern deceleration is added for fclose
• runtime also exports all stdio functions including fclose

Nb: fclose is not the only extern function affected

[sigmaSd]

I guess its on purpose, there is also cat-std

[lanmonster]

unable to reproduce on mac as of 1ea81c6. can users of other OSes comment on their experience?