Mining: add compile time option to disable p2pool

[selsta]

P2Pool doesn't work with all package manager setups, so it's best to add an option to disable it during compile time.

@devhyper @BigmenPixel0 @kpcyrd

[plowsof]

This would be great! i've seen / helped many users who are confused as to why their 'package manager' installed Monero GUI displays the 'p2pool failed to install message. UX ++

[q7nm]

I added p2pool to flatpak. Just haven't checked yet

[kpcyrd]

Is there something that can be done to fix the packages instead? :) I wasn't aware of any issues yet.

[selsta]

The GUI downloads the p2pool binary in the same directory as the monero-wallet-gui binary. I can imagine that package managers don't like this, as it's not the proper way to install something and also might cause permission issues.

Putting p2pool directly during the installation process in the same folder as monero-wallet-gui might work. Then you wouldn't need to disable it during compile time. But this has to be tested, as there are also log and config files written which again might cause permission issues.

[selsta]

Basically two options:

1. Disable during compile time
2. Install p2pool together with monero-wallet-gui, assuming everything was tested and works correctly

[kpcyrd]

p2pool is now available in Arch Linux: https://archlinux.org/packages/community/x86_64/p2pool/.

pacman -S p2pool installs a binary to /usr/bin/p2pool, the same directory that also contains monero-wallet-gui.