Revert "Follow TMPDIR environment variable"
This reverts commit 7982241d. The --tmpdir flag works fine with the `mktemp` shipped by coreutils in `/bin/mktemp`, but with the `/usr/bin/mktemp` brought in by coreutils-gplv2 the value of the TMPDIR variable is ignored and it tries to create a /build-snapshot.NtQMUAiQNC directory in the filesystem root, which fails. Sadly on the Jenkins build host we have both the GPLv3 coreutils and the mktemp packages installed, as the latter is tagged "essential", and since the executable shipped by the latter masks the former, the change broke the `build-snapshot` job. Revert the change until the old mktemp package gets dropped from the build host. Signed-off-by: Emanuele Aina <email@example.com>
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