linux-mainline: Update base image and fix build failures

[alistair23]

No description provided.

[Eeems]

[   DEBUG] toltec.builder: build(): In file included from /opt/x-tools/arm-remarkable-linux-gnueabihf/arm-remarkable-linux-gnueabihf/sysroot/usr/include/features.h:489,
[   DEBUG] toltec.builder: build(): from /opt/x-tools/arm-remarkable-linux-gnueabihf/arm-remarkable-linux-gnueabihf/sysroot/usr/include/bits/libc-header-start.h:33,
[   DEBUG] toltec.builder: build(): from /opt/x-tools/arm-remarkable-linux-gnueabihf/arm-remarkable-linux-gnueabihf/sysroot/usr/include/stdio.h:27,
[   DEBUG] toltec.builder: build(): from certs/extract-cert.c:15:
[   DEBUG] toltec.builder: build(): /opt/x-tools/arm-remarkable-linux-gnueabihf/arm-remarkable-linux-gnueabihf/sysroot/usr/include/gnu/stubs.h:7:11: fatal error: gnu/stubs-soft.h: No such file or directory
[   DEBUG] toltec.builder: build(): 7 | # include <gnu/stubs-soft.h>
[   DEBUG] toltec.builder: build(): |           ^~~~~~~~~~~~~~~~~~
[   DEBUG] toltec.builder: build(): compilation terminated.

[Eeems]

This might be due to trying to use the system pkgconfig instead of the toolchain version.

[alistair23]

Fixed! (Hopefully)

[alistair23]

Anything else for me to do here?

[alistair23]

Ping!

[Eeems]

Just the standard testing of the package build in the pipeline on 2.15 and 3.3.2 is required. I don't have capacity right now to do any testing.

[Eeems]

So one issue on 3.3.2 is that this kernel doesn't provide uinput, which breaks compatibility with the current version of oxide as well as keyd (#744).

@alistair23 we have three options here to resolve this:

1. Update the kernel to include uinput
2. Mark this package as conflicting with oxide, and we update Add package for keyd #744 to indicate it conflicts with linux-mainline
3. Add a known issue to the list that anything that depends on uinput will not work, and list keyd and oxide as examples