Bug#765679: nvidia-kernel-dkms: nvidia-kernel-modules not build for linux-image-3.2.0-4-amd64

[Alex Goebel]

Confirmed, same here with an up-to-date sid system, with the same 
versions as OP.

340.46 builds fine with other kernels (3.14, 3.16, 3.17), and up to 
340.32 (incl.), the nvidia module built successfully with 3.2.