qt 6.6.0 clean

mkspecs/features/mac/default_post.prf

@@ -50,29 +50,6 @@ contains(TEMPLATE, .*app) {
 
 !no_objective_c:CONFIG += objective_c
 
-qt {
-    qtConfig(static) {
-        # C++11 support means using libc++ instead of libstd++. As the
-        # two libraries are incompatible we need to ensure the end user
-        # project is built using the same C++11 support/no support as Qt.
-        qtConfig(c++11) {
-            CONFIG += c++11
-        } else: c++11 {
-            warning("Qt was not built with C++11 enabled, disabling feature")
-            CONFIG -= c++11
-        }
-
-        !c++11 {
-            # Explicitly use libstdc++ if C++11 support is not enabled,
-            # as otherwise the compiler will choose the standard library
-            # based on the deployment target, which for iOS 7 and OS X 10.9
-            # is libc++, and we can't mix and match the two.
-            QMAKE_CXXFLAGS += -stdlib=libstdc++
-            QMAKE_LFLAGS   += -stdlib=libstdc++
-        }
-    }
-}
-
 # Add the same default rpaths as Xcode does for new projects.
 # This is especially important for iOS/tvOS/watchOS where no other option is possible.
 !no_default_rpath {