Fix reporting of Qt detection method used on OSX

Ensure that from_text is set to the name of the qmake executable we used,
rather than the return value of _framework_detect(), which is always 'None'

mesonbuild/dependencies/ui.py

@@ -281,7 +281,8 @@ def _qmake_detect(self, mods, kwargs):
             (k, v) = tuple(line.split(':', 1))
             qvars[k] = v
         if mesonlib.is_osx():
-            return self._framework_detect(qvars, mods, kwargs)
+            self._framework_detect(qvars, mods, kwargs)
+            return qmake
         incdir = qvars['QT_INSTALL_HEADERS']
         self.compile_args.append('-I' + incdir)
         libdir = qvars['QT_INSTALL_LIBS']