README: Add Debian dependency instructions

[kirsle]

I managed to compile wayvnc for Mobian on Pinephone and identified the Debian names of dependencies needed.

These can be added to the README for posterity.

[any1]

Looks about right, which version of debian is that?

[kirsle]

It's on Debian ~~Buster~~ Bullseye, the distro that Mobian for the Pinephone is built from. Mobian uses upstream packages except for a small handful of overrides for mobile-friendly app patches, while they await upstreaming their patches to Debian proper.

[any1]

Hmm, wayvnc requires libxkbcommon v1.0.0 or newer, but buster only has v0.8.2. I guess Mobian has a newer one?

[kirsle]

It looks like Debian testing has version 1.0.3-2: https://tracker.debian.org/pkg/libxkbcommon

[kirsle@pine ~]% apt search libxkbcommon-dev
Sorting... Done
Full Text Search... Done
libxkbcommon-dev/testing,now 1.0.3-2 arm64 [installed]
  library interface to the XKB compiler - development files

I guess I misspoke earlier, it's Debian bullseye, not buster; bullseye is currently in the testing freeze for an upcoming release.

[zerkman]

Hi, thanks for the patch but you left a typo : you wrote libxbcommon-dev instead of libxkbcommon-dev.

Otherwise it builds fine on Debian bullseye.

[Strbean1]

On Mobian I also needed to install zlib1g-dev in order to compile the neatvnc subproject.

[kirsle]

Updated the PR to fix the libxkbcommon-dev typo and add zlib1g-dev.

[lack]

The current README has debian instructions now.

Closing this PR. Please feel free to rebase and reopen if the README needs more updating!