[RM-935] fix a problem which fails codesigning for shared framework with `rake device' with Xcode 7
[RM-935] fix a problem which fails codesigning for shared framework with `rake device' with Xcode 7

HipByte/RubyMotion,hboon/RubyMotion,hboon/RubyMotion,katsuyoshi/RubyMotion,hboon/RubyMotion,beni55/RubyMotion,katsuyoshi/RubyMotion,HipByte/RubyMotion,katsuyoshi/RubyMotion,HipByte/RubyMotion,katsuyoshi/RubyMotion,beni55/RubyMotion,beni55/RubyMotion,beni55/RubyMotion