Changes

adapt to linux-libc-dev having become a:all+m-a:foreign

Most of the time, we no longer have to rebuild linux-libc-dev.
Sometimes, it's missing headers though and then we need to rebuild it,
but not as a cross build, but an indep-only build.

linux: circumvent control generation protection more reliably

reenable building of gcc-13 common libraries

gcc-14 entered unstable.

adapt linux patching to toml based configuration

rewrite wdotap patch set on top of gcc-for-host changes

The merging of gcc-for-host caused a lot of changes to the gcc packaging
and made the wdotap patch set from cross-gcc-dev no longer work. It
required significant changes and quite some aspects could be dropped
resulting in a much smaller patch that is inlined in rebootstrap for
now. We'll see whether that works better or worse.

don't attempt to install linux-libc-dev with an :arch qualifier

enable wdotap patch for gcc-14

linux: always regenerate d/control

Since linux-libc-dev is arch:all now, we only have two cases. Either the
one in the archive is good enough or we get to build it. When we build
it, we bump the version. When we bump the version, we must regenerate
d/control (changed in src:linux).

gcc: move -for-host packages from cross toolchain to rtlibs build #1069065

new linux d/control dependency python3-dacite