Calls to `rm -rf` and `mkdir` are improperly quoted

Calls to `rm -rf` and `mkdir`, such as in `rm -rf $BUILD_TMPDIR` and `mkdir -p $INSTALLDIR` are not properly quoted and therefore do not handle paths containing spaces. I would go so far as to consider this a security issue, as the generated script may end up force-deleting any directory on a user's system for which it has permission to do so.

This issue is most apparent on Windows systems, where paths containing spaces are commonplace.

Start by searching the rules_foreign_cc sources for generation of the `rm -rf` and `mkdir -p` commands shown in the issue. Reproduce the generated script with paths containing spaces, especially on Windows, and verify that those commands preserve each path as a single argument without enabling unintended deletion.

Written by the indexing model from the issue text.