weston: backport patch to allow neatvnc < v0.9.0

weston: backport patch to allow neatvnc < v0.9.0

Currently weston 13.0.3 with neatvnc 0.8.1 does not compile when using
VNC:

| Dependency neatvnc found: NO found 0.8.1 but need: '< 0.8.0' ;
matched: '>= 0.7.0'

However weston upstream already increased the allowed version to 0.9.0,
since neatvnc 0.8.0 does not introduce any changes that breaks API used
by the VNC backend. Therefore, backport this patch.

Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>