build-sys: make it a seperately buildable spice-common library
build-sys: make it a seperately buildable spice-common library

- autotoolize
- fix headers inclusion
- generate gitignores
- workaround serverSMARTCARD support with dirty hack...

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