SuperBuild: enable qttools to compile linguist

SuperBuild/CMake/External_qt5.cmake

@@ -50,7 +50,8 @@ endif()
 file(TO_NATIVE_PATH ${QT5_SB_SRC} QT5_SB_SRC_NATIVE)
 
 #Common options for all cases
-# -skip qtbase 
+# -skip qtbase
+# -skip qttools  (need linguist)
 set(QT5_SB_CONFIG
   "-prefix ${QT5_INSTALL_PREFIX_NATIVE} -L ${QT5_LIB_PREFIX_NATIVE} \
   -I ${QT5_INCLUDE_PREFIX_NATIVE} -I ${QT5_INCLUDE_FREETYPE_NATIVE} \
@@ -83,7 +84,6 @@ set(QT5_SB_CONFIG
   -skip qtserialport  \
   -skip qtspeech \
   -skip qtsvg  \
-  -skip qttools  \
   -skip qttranslations  \
   -skip qtvirtualkeyboard  \
   -skip qtwayland  \