Specify minimum SDK version for protobuf project just in case

With this CL, the minimum SDK version is specified for the protobuf project.

This is just in case change, and supposed to change nothing in production.

BUG=none
TEST=compile

git-svn-id: https://mozc.googlecode.com/svn/trunk@422 a6090854-d499-a067-5803-1114d4e51264
2 files changed
tree: 344dd46dcbaf147e45b37e4b285ace390547c148
  1. src/