RFS: mapserver/6.4.0-2 (#723991) and osgearth/2.4.0+dfsg-5 (#723996)

[Sebastiaan Couwenberg]

Hi Francesco,

Can you sponsor the upload of mapserver/6.4.0-2 (#723991) and
osgearth/2.4.0+dfsg-5 (#723996)?

Both packages fix issues with transitional packages for the their shared
libraries (#723979 and #723980 respectively).

The mapserver update also includes a fix for #667771, and some changes
to support building MapCache with MapServer support.

Kind Regards,

Bas

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