Merge topic 'update-kwsys'

edad0369 Merge branch 'upstream-kwsys' into update-kwsys
397bccba KWSys 2014-05-05 (f3a36760)
Merge topic 'ExternalProject_labels'

93730bb3 ExternalProject: Set FOLDER property to targets
39ef8046 ExternalProject: Set LABELS property to targets
Merge topic 'InstallRequiredSystemLibraries-vs12-mfc'

c0a6646d InstallRequiredSystemLibraries: MBCS MFC is optional on VS 12 (#14903)
Merge topic 'xcode-sdkroot'

5dfe9b7d Xcode: Find fallback SDK if one matching the OS version doesn't exist.
Merge topic 'osx-iframework'

1bed75a5 OS X: Use -iframework for system framework directories
Merge branch 'master' into next