[Android] Fix the embedded mode can't work in the packaging tool.

The packaging tool has an additional space around '=' which makes
the native library is not included for embedded mode.

BUG=https://crosswalk-project.org/jira/browse/XWALK-607
Merge pull request #1227 from yongsheng/fixembedded

[Android] Fix the embedded mode can't work in the packaging tool.