OSX dirty QMAKE_MAC_SDK.$${sdk}.$${info}

Change in

http://code.qt.io/cgit/qt/qtbase.git/commit/mkspecs/features/mac/sdk.prf?h=5.9.2&id=fa7626713b3a943609453459190e16c49d61dfd3

 Where:
+ equals(info, "Path"): \
+ info = --show-sdk-path
+ equals(info, "PlatformPath"): \
+ info = --show-sdk-platform-path
+ equals(info, "SDKVersion"): \
+ info = --show-sdk-version
 

"info" is overwritten, so it creates dirty variable QMAKE_MAC_SDK.$${sdk}.$${info} names as info takes same name as xcodebuild parameter (for example: former QMAKE_MAC_SDK.macosx.Path becomes QMAKE_MAC_SDK.macosx.--show-sdk-path).

It isn't a bug, but it is quite dirty and breaks previous behaviour (I had a mkspecs where I set these variables, and now need to update it).