fix archs setting in framework

http://hipbyte.myjetbrains.com/youtrack/issue/RM-670

d141498e58 patch need this changing.

lib/motion/project/target/framework_target.rb

@@ -151,7 +151,8 @@ PLIST
         "RM_TARGET_DEPLOYMENT_TARGET=\"#{@config.deployment_target}\"",
         "RM_TARGET_XCODE_DIR=\"#{@config.xcode_dir}\"",
         "RM_TARGET_HOST_APP_PATH=\"#{File.expand_path(@config.project_dir)}\"",
-        "RM_TARGET_BUILD=\"1\""
+        "RM_TARGET_BUILD=\"1\"",
+        "RM_TARGET_ARCHS='#{@config.archs.inspect}'"
       ].join(' ')
     end