yanjun commit
Revert "yanjun commit"

This reverts commit f98d0acbaeb6732d6c10feaab5e42158ecb5f0d7.
changes for yanjun
delete the build directory for nativemedia module
delete the build directory of the nativemedia module
Merge branch 'yanjun' of https://github.com/yanjunbill/first into yanjun