Bug#607857: tex-common: Hard-coded path in proposed patch

[Braun Gábor <braung@renyi.hu>]

Package: tex-common
Followup-For: Bug #607857

AFAIK the paths texlive uses can be freely configured by the sysadmin.
So I think the paths /var/lib/texmf/ etc in the examples are
simplification to clearly state the idea and not meant to appear
in real code.

Therefore I suggest to modify the proposed patch of ponstinst.in to 
obtain the path from the relevant configuration variable
(which I guess is TEXMFSYSVAR as this seems to be the one used by 
updmap-sys).

Best wishes,

	Gábor Braun