compile.sh: Rename env var DISTRIBUTION to BAZEL_DISTRIBUTION
compile.sh: Rename env var DISTRIBUTION to BAZEL_DISTRIBUTION

In the Debian build environment, the DISTRIBUTION env var may be used for
other purpose, so we rename the env var name to avoid conflict.

Closes #12044.

PiperOrigin-RevId: 329877157

ButterflyNetwork/bazel,bazelbuild/bazel,davidzchen/bazel,meteorcloudy/bazel,katre/bazel,cushon/bazel,cushon/bazel,katre/bazel,davidzchen/bazel,ButterflyNetwork/bazel,safarmer/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,perezd/bazel,katre/bazel,safarmer/bazel,perezd/bazel,katre/bazel,cushon/bazel,katre/bazel,perezd/bazel,meteorcloudy/bazel,bazelbuild/bazel,twitter-forks/bazel,davidzchen/bazel,bazelbuild/bazel,cushon/bazel,davidzchen/bazel,perezd/bazel,cushon/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,bazelbuild/bazel,davidzchen/bazel,safarmer/bazel,safarmer/bazel,meteorcloudy/bazel,twitter-forks/bazel,katre/bazel,safarmer/bazel,cushon/bazel,meteorcloudy/bazel,twitter-forks/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,twitter-forks/bazel,davidzchen/bazel,meteorcloudy/bazel,safarmer/bazel,perezd/bazel,perezd/bazel,twitter-forks/bazel,bazelbuild/bazel,ButterflyNetwork/bazel,davidzchen/bazel,perezd/bazel