Be explicit about spice-common license
Be explicit about spice-common license

Use same license as spice-gtk and spice modules (LGPL 2.1) since those licenses
applied to the spice-common submodule in the past.  This makes it more clear
that if you use spice-common separately, the license is still LGPL.  Also
mention license and copyright in generated files.

vdiot/spice-protocol,SPICE/spice-protocol,vdiot/spice-protocol,vdiot/spice-protocol,SPICE/spice-protocol,SPICE/spice-protocol,fgouget/spice-protocol,fgouget/spice-protocol,fgouget/spice-protocol