File _patchinfo of Package patchinfo.348

<patchinfo incident="348">
  <summary>Handle tilde in package version</summary>
  Tolerate tilde in package version. This allows building packages which use the tilde to indicate a pre version.
  Note: zypper will not handle tilde in 11.4, '1.0~rc1' is seen as newer than '1.0'.
  Handle also /etc/alternatives properly to fix buildfailures which happen with some newer packages.