tmpdir not always configured correctly

[lucarin91]

adbd of debian is leaving the TMPDIR env variable to /data/local/tmp which is the android place and not the linux default one. Here in this debian image we use the following workaround https://github.com/arduino/arduino-deb-images/blob/77a019b2e0b446f05fccc5220bf0f8d18079d8bc/debos-recipes/overlays/arduino-unoq-releases/etc/profile.d/50-fix-adb-shell.sh to change that on interactive shell. But this leave that not correctly set in cases like the following:

adb shell printenv TMPDIR

which will still return /data/local/tmp and not /tmp

To fix this issue we should probably do another adbd patch that set TMPDIR=/tmp before running the exec command here