qmake: Don't _debug-suffix libraries in single config framework builds

On Apple platforms we no longer _debug suffix libraries (and plugins)
in single config framework builds. This is a follow-up for logic in
qmake that didn't get adjusted in d3be87ff1d558f05309b1f29f7e71f291498584f.

Pick-to: 6.8
Change-Id: I6461fca9da5c3ac1382ffc46e63409ef0150ad46
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

mkspecs/features/qt_functions.prf

@@ -19,8 +19,13 @@ defineReplace(qtPlatformTargetSuffix) {
     }
     darwin {
         contains($$config_variable, debug, debug|release) {
-            !debug_and_release|build_pass: \
-                return($${suffix}_debug)
+            debug_and_release {
+                build_pass: \
+                    return($${suffix}_debug)
+            } else {
+                !qtConfig(framework): \
+                    return($${suffix}_debug)
+            }
         }
     }
     return($$suffix)

mkspecs/features/resolve_config.prf

@@ -45,7 +45,7 @@ CONFIG(debug, debug|release) {
             equals(build, debug): \
                 suffix = _debug
         } else {
-            contains(QT_CONFIG, debug): \
+            !qtConfig(framework):contains(QT_CONFIG, debug): \
                 suffix = _debug
         }