Fix tst_qresourceengine for platforms with embedded test data

load(resources) makes embedding the test data into the executable
fail for platforms that use builtin test data. As the load call
is only used to obtain QMAKE_RCC we can avoid that call by
assuming that rcc was not renamed and assembling the path ourself.

Change-Id: I25b982d10f5617d9a213803e7e4bcc85fc66b2e7
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>

tests/auto/corelib/io/qresourceengine/qresourceengine.pro

@@ -1,13 +1,13 @@
 CONFIG += testcase
 TARGET = tst_qresourceengine
-load(resources)
+
 QT = core testlib
 SOURCES = tst_qresourceengine.cpp
 RESOURCES += testqrc/test.qrc
 
 runtime_resource.target = runtime_resource.rcc
 runtime_resource.depends = $$PWD/testqrc/test.qrc
-runtime_resource.commands = $$QMAKE_RCC -root /runtime_resource/ -binary $${runtime_resource.depends} -o $${runtime_resource.target}
+runtime_resource.commands = $$[QT_INSTALL_BINS]/rcc -root /runtime_resource/ -binary $${runtime_resource.depends} -o $${runtime_resource.target}
 QMAKE_EXTRA_TARGETS = runtime_resource
 PRE_TARGETDEPS += $${runtime_resource.target}
 QMAKE_DISTCLEAN += $${runtime_resource.target}