Android Studio2.x中NDK开发支持c++11

http://www.slideshare.net/ph0b/mastering-the-ndk-with-android-studio-and-the-gradleexperimental-plugin

ndk {
    moduleName = 'xduilib'
    stl = 'gnustl_static'
    cppFlags.add("-std=c++11")
    ldFlags.add("-c")
    ldLibs.addAll(['log', 'android'])
}