[autotest] tst_qdeclarativemoduleplugin fails on OSX 10.8

This test is always failing on macx-clang_developer-build_OSX_10.8 stage.
See http://testresults.qt-project.org/ci//Qt5_stable_Integration/build_00391/macx-clang_developer-build_OSX_10.8/log.txt.gz

FAIL! : tst_qdeclarativemoduleplugin::incorrectPluginCase() Compared values are not the same
Actual (errors.at(0).description()): module "com.nokia.WrongCase" plugin "PluGin" not found
Expected (expectedError): plugin cannot be loaded for module "com.nokia.WrongCase": File name case mismatch for "/work/build/qtquick1/tests/auto/declarative/qdeclarativemoduleplugin/imports/com/nokia/WrongCase/libPluGin.dylib"
Loc: [tst_qdeclarativemoduleplugin.cpp(181)]