rcc: Change two-pass feature from opt-out to opt-in

This makes the 'big-data' feature introduced and made mandatory with
commit 5395180f

 opt-in trough CONFIG += resources_big.

Since the feature has been introduced several setups have been
found where the feature cannot be used, or not be used out-of-the-box.
Using the traditional default behavior lowers the risk of further
breakages.

Change-Id: Ifd04204adadeec539e962d6a9a6955f63781bd36
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@theqtcompany.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>

mkspecs/features/resources.prf

@@ -11,7 +11,7 @@ rcc.name = RCC ${QMAKE_FILE_IN}
 rcc.depend_command = $$QMAKE_RCC_DEP -list $$QMAKE_RESOURCE_FLAGS ${QMAKE_FILE_IN}
 rcc.CONFIG += add_inputs_as_makefile_deps
 
-resources_small|ltcg|macx-xcode|contains(TEMPLATE, "vc.*") {
+!resources_big|ltcg|macx-xcode|contains(TEMPLATE, "vc.*") {
 
 rcc.output = $$RCC_DIR/$${first(QMAKE_MOD_RCC)}_${QMAKE_FILE_BASE}$${first(QMAKE_EXT_CPP)}
 rcc.commands = $$QMAKE_RCC $$QMAKE_RESOURCE_FLAGS ${QMAKE_FILE_IN} -o ${QMAKE_FILE_OUT}