File _patchinfo of Package patchinfo.8705

<patchinfo incident="8705">
  <issue tracker="bnc" id="1107442" />
  <category>optional</category>
  <rating>moderate</rating>
  <packager>AndreasStieger</packager>
  <summary>Optional update to add gn</summary>
  <description>This update adds gn, a build dependency for an upcoming Chromium update.
    
Gn is a a meta-build system that generates build files for Ninja.
</description>
</patchinfo>