[tlbuild] trial builds for TL'13

[Karl Berry]

Hi Nikola,

    r29567 builds fine on FreeBSD i386 and amd64, with two minor glitches:

Good, thanks.

    - --- source/texk/web2c/luatexdir/lua52/liolib.c	(revision 29567)
    +++ source/texk/web2c/luatexdir/lua52/liolib.c	(working copy)
    @@ -15,6 +15,7 @@
     #include <stdio.h>
     #include <stdlib.h>
     #include <string.h>
    +#include <unistd.h>

Ok, will install, I feel pretty confident Taco will accept it too :).

    < Message 44 in Test.tex: User Regex:  intro..
    - ---
    > Message 44 in Test.tex: User Regex: (null).

We've received a patch from the maintainer for this (thanks to Mojca and
Dick).  I'll install it in the sources shortly if not done already.

Best,
Karl