Avoid non-async-signal-safe functionality between fork and exec

This is a partial revert of 17642437fe0d68cf868ab430f04b4fdc12f1767f "reduce
ifdef forest".  The original code used unsetenv only for certain platforms, and
putenv for others, but code a few lines further down uses unsetenv
unconditionally, so assume that it is safe to use on all relevant platforms
these days.

unsetenv isn't listed as async-signal-safe at <http://pubs.opengroup.org/
onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04_03> "Signal Actions"
(but is already used a few lines further down, also between fork and exec), but
at least we get rid of the memory management involved in the OUString instance.

Change-Id: Iac993db8819d40a0841c455ed04ff9ca2ee2e4eb
Reviewed-on: https://gerrit.libreoffice.org/77368
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

0 files changed, 0 insertions, 0 deletions