A message with a fixed-size array, such as uint8 uuid[16] will
generate an invalid code, missing the __nelements variable. Make sure
that variable is defined.

Remove any blank lines at the end of all source files

With the new usbredir code we have the new concept of the abstract /
generic spicevmc channel type (which just tunnels data from a qemu chardev),
and we've the usbredir channel, which is the only current user of this.

This was reflected in the protocols enum in spice-protocol.h by a manual
edit done by me, my bad. This patch teaches spice.proto about the relation
between the abstract spicevmc channel and the usbredir channel and
modifies codegen to deal with this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Check both in configure.ac (after checking if we need to rebuild
the marshalling files) and in the python script using pyparsing
(for people modifying .proto files in tarballs)

Commit 9d5ef9beeca722b2ceff7d15aaa3aaaaf07ecfbf in spice-protocol
introduced a typedef manually in the generated enums.h header.

This patch adds them automatically to all enums during enums.h generation.

python_modules/demarshal.py and marshal.py fixes for gcc 4.6.0
warning about set but unused variables. The fixes disable creating
of variables mem_size when they are not used (demarshall) and
declaring a src variable when the message doesn't use it (marshal).

You need to touch *.proto after applying this (should add a Makefile
dependency).