Do not install tests

Index: cmake/QbsBuildConfig.cmake
--- cmake/QbsBuildConfig.cmake.orig
+++ cmake/QbsBuildConfig.cmake
@@ -256,6 +256,6 @@ function(add_qbs_test test_name)
         INSTALL_RPATH "${QBS_APP_RPATH}"
         MACOSX_RPATH ${QBS_MACOSX_RPATH}
         )
-    install(TARGETS ${target_name} RUNTIME DESTINATION ${QBS_APP_INSTALL_DIR})
+    #install(TARGETS ${target_name} RUNTIME DESTINATION ${QBS_APP_INSTALL_DIR})
     add_test(NAME ${target_name} COMMAND ${target_name})
 endfunction()