Bug#253094: tetex-bin postinst does not obey TMPDIR

[Riku Voipio <nchip@kos.to>]

Package: tetex-bin
Version: 2.0.2-14
Severity: important

tetex-bin postinst sets TMPDIR to /tmp, so any setting done
by admin gets ignored. this brakes (sometimes) installs on
distributed enviroments where /tmp isn't shared between
nodes.

-- System Information:
Debian Release: 3.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i586)
Kernel: Linux 2.6.6
Locale: LANG=C, LC_CTYPE=fi_FI.ISO8859-1

Versions of packages tetex-bin depends on:
ii  debconf                     1.4.25       Debian configuration management sy
ii  debianutils                 2.6.1        Miscellaneous utilities specific t
ii  dpkg                        1.10.9       Package maintenance system for Deb
ii  ed                          0.2-19       The classic unix line editor
ii  libc6                       2.3.2.ds1-12 GNU C Library: Shared libraries an
ii  libgcc1                     1:3.3.3-7    GCC support library
ii  libice6                     4.3.0-3      Inter-Client Exchange library
ii  libkpathsea3                2.0.2-14     path search library for teTeX (run
ii  libpaper1                   1.1.13       Library for handling paper charact
ii  libpng12-0                  1.2.5.0-4    PNG library - runtime
ii  libsm6                      4.3.0-3      X Window System Session Management
ii  libstdc++5                  1:3.3.3-7    The GNU Standard C++ Library v3
ii  libt1-5                     5.0.2-3      Type 1 font rasterizer library - r
ii  libwww0                     5.4.0-9      The W3C WWW library
ii  libx11-6                    4.3.0-3      X Window System protocol client li
ii  libxaw7                     4.1.0-16     X Athena widget set library
ii  libxext6                    4.3.0-3      X Window System miscellaneous exte
ii  libxmu6                     4.3.0-3      X Window System miscellaneous util
ii  libxt6                      4.3.0-3      X Toolkit Intrinsics
ii  mime-support                3.18-1       MIME files 'mime.types' & 'mailcap
ii  perl                        5.8.4-2      Larry Wall's Practical Extraction 
ii  sed                         4.0.7-3      The GNU sed stream editor
ii  tetex-base                  2.0.2-8      Basic library files of teTeX
ii  ucf                         1.06         Update Configuration File: preserv
ii  xlibs                       4.3.0-3      X Window System client libraries m
ii  zlib1g                      1:1.2.1-2    compression library - runtime

-- debconf information:
  tetex-bin/upd_map: true
* tetex-bin/cnf_name: 
  tetex-bin/fmtutil: true
  tetex-bin/userperm: false
* tetex-bin/hyphen: 
  tetex-bin/oldcfg: true
* tetex-bin/use_debconf: true
* tetex-bin/groupname: users
  tetex-bin/groupperm: true
* tetex-bin/lsr-perms: true