am ce7d5023: Turn dalvikvm host builds on by default when linux is the host OS.

Merge commit 'ce7d5023c3df4c16ae395d64d51dd8345e40a39e' into gingerbread-plus-aosp

* commit 'ce7d5023c3df4c16ae395d64d51dd8345e40a39e':
  Turn dalvikvm host builds on by default when linux is the host OS.