12.1.0 and 13.1.0 provide absurdly small temporary space

[Mikus Grinbergs]

> I was unable to reproduce on 13.1.0.

My apologies - I wrote without realizing that I haven't experience this 
with recent 13.1.0 builds (but I do remember it on 13.1.0 - maybe it was 
on the initial builds).

I definitely do currently experience the too-small-tmp-size with my 
(customized) 12.1.0 build 21.  My bypass is to issue 'umount -l /tmp' 
followed by 'mount -a' - that restores /tmp to the size I have in my fstab.

mikus