CMake build step does not work with multiple targets

CMake does not support multiple --target arguments being passed on the command line. Until [1], specifying --target multiple times silently ignored all targets but the last one.

Still, since the change at [2], line 322 and following, Qt Creator will potentially invoke CMake with arguments --target. So far my comment in Gerrit was ignored, so I'm filing this bug in the hope of getting attention.

[1] https://github.com/Kitware/CMake/pull/214
[2] https://codereview.qt-project.org/#/c/145242/5/src/plugins/cmakeprojectmanager/cmakebuildstep.cpp