configure: if there's no fontconfig, assume no fonts are available

No idea how to check what fonts are installed on Windows/Mac;
only safe thing to do is to disable the tests if --without-fonts.

Change-Id: Ia27d866d9964f7e4e1ebfaba7ee4a7ce53b800b0

configure.ac

@@ -11150,7 +11150,7 @@ else
             fi
         fi
     else
-        TEST_FONTS_MISSING=0
+        TEST_FONTS_MISSING=1
     fi
 fi
 AC_SUBST(WITH_FONTS)