Travis: try containerized builds without sudo
Travis: try containerized builds without sudo

Salamek/librsync,dbaarda/librsync,yrgoldteeth/librsync,sourcefrog/librsync,Salamek/librsync,dbaarda/librsync,sourcefrog/librsync,yrgoldteeth/librsync,yrgoldteeth/librsync,dbaarda/librsync,Salamek/librsync,librsync/librsync,sourcefrog/librsync,sourcefrog/librsync,yrgoldteeth/librsync,librsync/librsync,librsync/librsync,librsync/librsync,dbaarda/librsync