Disable tests requiring shared build when compiling statically

Change-Id: I06ec53e46d2f61f1685899b0f8a4d385051095d6
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>

tests/auto/corelib/plugin/plugin.pro

@@ -5,3 +5,9 @@ SUBDIRS=\
     qplugin \
     qpluginloader \
     quuid
+
+contains(CONFIG, static) {
+    message(Disabling tests requiring shared build of Qt)
+    SUBDIRS -= qfactoryloader \
+               qpluginloader
+}