Review Request 121076: Do not require KF5::Su on Windows

[Pedro Francisco]

I'm sorry, but isn't this on master yet? Thanks in Advance.

CMake Warning at r:/share/ECM/find-modules/FindKF5.cmake:75 (find_package):
  Could not find a package configuration file provided by "KF5Su" with any of
  the following names:

    KF5SuConfig.cmake
    kf5su-config.cmake

  Add the installation prefix of "KF5Su" to CMAKE_PREFIX_PATH or set
  "KF5Su_DIR" to a directory containing one of the above files.  If "KF5Su"
  provides a separate development package or SDK, be sure it has been
  installed.
Call Stack (most recent call first):
  CMakeLists.txt:23 (find_package)


-- Could NOT find KF5Su: found neither KF5SuConfig.cmake nor kf5su-config.cmake