Missing import in xpra/codecs/webp/encode.pyx

[jonathan.underwood]

xpra-1.0 fails to build, complaining about this:

Compiling xpra/net/ben
Error compiling Cython file:
------------------------------------------------------------
...
import os

from xpra.log import Logger
log = Logger("encoder", "webp")

from xpra.util envbool
              ^
------------------------------------------------------------

xpra/codecs/webp/encode.pyx:11:15: Expected 'import' or 'cimport'
code/cython_bencode.pyx because it changed.
Compiling xpra/net/vsock.pyx because it changed.

Patch attached (trivial).

[Antoine Martin]

Thanks, applied to v1.0.x in r14524.

Note: all the packages we build have had webp disabled and webp support has now been removed in trunk as of r14508, together with csc_opencl and csc_opencv.
That's because:

• loading our own build of webp (since #613) was causing too many problems: conflicts with python pillow loading the system one, performance differences between different versions and platforms, etc
• opencl is buggy (see AMD opencl icd signal dispatch bugs)
• opencv csc was too slow