tests: Allow tests to use creator libs/plugins directly (linux/mac)

tests/auto/cplusplus/shared/shared.pri

 DEFINES+=CPLUSPLUS_BUILD_STATIC_LIB
-include(../../../../qtcreator.pri)
 INCLUDEPATH += $$IDE_SOURCE_TREE/src/libs/cplusplus
 INCLUDEPATH += $$IDE_SOURCE_TREE/src/shared/cplusplus
 include($$IDE_SOURCE_TREE/src/plugins/cpptools/cpptools.pri)

tests/auto/qttest.pri

+include(../../qtcreator.pri)
+
 isEmpty(TEMPLATE):TEMPLATE=app
 CONFIG += qt warn_on console depend_includepath testcase qtestlib
 CONFIG -= app_bundle
@@ -9,5 +11,14 @@ symbian:{
     RSS_RULES ="group_name=\"QtTests\";"
 }
 
+unix:{
+    QMAKE_RPATHDIR += $$IDE_BUILD_TREE/$$IDE_LIBRARY_BASENAME/qtcreator
+    QMAKE_RPATHDIR += $$IDE_PLUGIN_PATH/Nokia
+
+    IDE_PLUGIN_RPATH = $$join(QMAKE_RPATHDIR, ":")
+
+    QMAKE_LFLAGS += -Wl,-z,origin \'-Wl,-rpath,$${IDE_PLUGIN_RPATH}\'
+}
+
 # prefix test binary with tst_
 !contains(TARGET, ^tst_.*):TARGET = $$join(TARGET,,"tst_")