- Allow newer versions of kiwi to be built in SUSE internal build service
  for older versions of SLE
  + SUSE internal build service does not define the sles_version macro, need
    to do ugly nexted if conditions. Luckyly we no longer build openSUSE
    versions that have the same version identifiers as older SLE versions
Merge pull request #331 from rjschwei/slesBuilIBS

Update creation of %mysystems macro in case if %sles_version is missing