pyuic5 bug with QFontComboBox

[Baz Walter]

When using PyQt-5.15.4, the ui compiler cannot handle QFontDatabase enums.

The minimal test-case below raises the following exception:

     PyQt5.uic.exceptions.NoSuchClassError: Unknown C++ class: QFontDatabase

Test-case:

     from io import StringIO
     from PyQt5 import uic, QtWidgets

     app = QtWidgets.QApplication(['test'])

     uic.loadUiType(StringIO("""\
     <?xml version="1.0" encoding="UTF-8"?>
     <ui version="4.0">
      <class>Form</class>
      <widget class="QWidget" name="Form">
       <widget class="QFontComboBox" name="fontComboBox">
        <property name="writingSystem">
         <enum>QFontDatabase::Latin</enum>
        </property>
       </widget>
      </widget>
      <resources/>
      <connections/>
     </ui>
     """))

(NB: ui file was generated by Qt Designer 5.15.2)
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