we now using git tag for version number control, but if
we release the code without .git/ folder, the git tag version
number is not present, so will cause compile error.
add the .tarball-version file as the local version number file,
it still can be generated by the autogen.sh from git tag. So
everytime anyone make a git tag should still modify the
.tarball-version file.
Signed-off-by: Zhu Yingjiang <yingjiang.zhu@linux.intel.com>
Zhu Yingjiang