Add CleanSpec.mk entries for linux -> linux_glibc

Soong renamed intermediate directories from linux_(common|x86|x86_64)...
to linux_glibc_(common|x86|x86_64)..., so remove the old versions to
save space.

Test: Check for old intermediates after applying and running cleanspec
Change-Id: I73ff39014491826224535e1d45c2215669fd19a2