Add PDBs to windows distribution

[myk002]

• add /Zi to the compile flags
• add /DEBUG to the link flags

and package where?

[ab9rf]

just store the PDBs as a build artifact, they do not need to be sent to subscribers; mostly in order to usefully diagnose crash reports i need to have a PDB that exactly matches the executable the user is using; that is, it was generated by the same compilation run as the executable was

there's no real harm in packaging the pdb into the distribution (and in fact there might be some benefit in doing so) but they will make it larger

[lethosor]

We used to do this on Buildmaster and just kept the artifacts separate.