修改CMake最低版本

git-svn-id: https://qlanguage.googlecode.com/svn/trunk@293 6d982bb3-a5a7-393d-ffc5-582415be9c85
修正Linux下编译失败

git-svn-id: https://qlanguage.googlecode.com/svn/trunk@294 6d982bb3-a5a7-393d-ffc5-582415be9c85