Revert "Parallelize the compression in mkbundle."

This reverts commit d168c95182f2619670428ccc78674d1235fb9cc9.

Revert this as it breaks mtouch.
Add missing prepare phase to eval
Fix duplicate metadata override entry.
Remove System.Net.Http from MT mobile build
Don't emit symbol file entry for partial method declarations. Fixes #11704
Bump version to 3.0.10