[tlbuild] Make check-TESTS fails

[Akira Kakuto]

Hi Angelo,

> Sorry! It still fails as follows.
> 
> There are many 'fail' ignored, I think:
> 
> ----------------------------------------
> [...]
> PASS: trap.test
> lstat(./dvitomp) failed ...
> ./dvitomp: No such file or directory
> lstat(./dvitomp) failed ...
> ./dvitomp: No such file or directory
... ...

dvitomp (symbolic link to mpost) should exist.

Thanks,
Akira