[tlbuild] [tex-live] laulatex quiting: fix your writable cachepath

[Élie Roux]

> Are we sure that the TL2013 i386-linux build of luatex is truly OK?

(See my previous mail) I have tested and it's not working well, neither 
with the TL2013 binary (r30739 nor r30845). Maybe there was a confusion 
in my last mail though: when I said r4639 was working, I was talking 
about the LuaTeX SVN, not the TL SVN...

Thank you,
-- 
Elie