qemu-nvmm: Unbreak build
From emul/qemu:
Make sure the package finds its tools for building docs
Patch bashism
Add dependencies
Re-gen PLIST
-- Still fails for me, though, with
% qemu-system-x86_64 -accel nvmm ./debian8_64
WARNING: Image format was not specified for './debian8_64' and probing guessed raw.
Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
qemu-system-x86_64: NVMM: No accelerator found, error=2
qemu-system-x86_64: failed to initialize NVMM: No space left on device
%
% config -x | grep nvmm
pseudo-device nvmm # NetBSD Virtual Machine Monitor
%
UnifiedSplitRaw
