also set TMP in addition to TMPDIR

primarily for Windows where unittests also use Windows' GetTempPathW
function that prefers TMP over TEMP over USERPROFILE over the windows
directory/doesn't respect TMPDIR

Unittests not using TMPDIR is annoying since bitdefender will block
access on some CVE tests. While you can create "dev drives" now that
also allow you to disable AV-scanning permanently on those, that of
course won't help when the files are created outside the devdrive/in the
default temporary directory.

Using TEMPDIR allows to specify the dir in autogen.input and the user
won't have to add the regular temp-dir to AV-exclusions or remember to
always disable the real-time-scanning before starting a build.

Change-Id: I47349e4318e8de99e45961a4989975cf4081fc07
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/174267
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Jenkins

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