Install tar in MSYS on Windows machines
Install tar in MSYS on Windows machines

tar is needed for bazel_boostrap_distfile_test

Change-Id: I333e5fe6eab3ea20a6ddefbc5cf672c5413fbfec

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration