SALOME_USE_64BIT_IDS should be stored in a cmake config for other projects

[looooo]

Issue description

FreeCAD relies on smesh. In earlier versions of smesh SALOME_USE_64BIT_IDS was not set and therefor 32bit ids were used.
To solve this FreeCAD needs to know if smesh was compiled with SALOME_USE_64BIT_IDS set or not. So somehow this information must be passed to the Freecad-build process.