Add CLEANPATH and CLEANLIB for building clean-base without dependencies

Ghost Userrequested to merge
fix-clean-base into master

Fixes #23 (closed); fixes #25 (closed).

CLEANPATH and CLEANLIB are looked at by clm to find the compiler and StdEnv. Because these were not set, clm was still using the locally installed compiler and StdEnv (#23 (closed)), as well as the locally installed linker causing #25 (closed).

These changes can probably be ported to the build.sh for other platforms, though I cannot test that so I didn't make these changes.

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