Parameterize vendor prefix and PCI device id
Parameterize vendor prefix and PCI device id

The XenServer PV vendor prefix ('XS') and PCI device (C000) are still
hard-coded into the XENIFACE package. These need to be stripped out and
replaced by values that can be customized at build time. This patch does
that.

The patch also reverts to building version.h and customizing xeniface.inf
directly in build.py.

Signed-off-by: Paul Durrant <dba6cd059c0054f8a3c62ba902cd9d7238853ee4@citrix.com>

omeg/xeniface,omeg/xeniface,QubesOS/qubes-vmm-xen-win-pvdrivers-xeniface,QubesOS/qubes-vmm-xen-win-pvdrivers-xeniface,omeg/xeniface,QubesOS/qubes-vmm-xen-win-pvdrivers-xeniface