add TUN, GRE, VTI, IKCONFIG, to all targets

[rminnich]

Necessary for testing with githb.com/u-root/cpu/vm.

Although I'm still puzzled how the vmscript tests
passed, since none of this was enabled.

The IKCONFIG is so, in future, users of these kernels can more easily see what's enabled. The kernels
are included as binaries in the github.com/cpu/vm
package, to avoid any issues accessing ghcr.io, so it's good to have /proc/config.gz there.

[hugelgupf]

@rminnich build failure in the amd64 kernel?

[rminnich]

#12 9.104 In file included from ./include/uapi/linux/posix_types.h:5,
#12 9.104                  from ./include/uapi/linux/types.h:14,
#12 9.104                  from ./include/linux/types.h:6,
#12 9.104                  from arch/x86/realmode/rm/wakeup.h:11,
#12 9.104                  from arch/x86/realmode/rm/wakemain.c:2:
#12 9.104 ./include/linux/stddef.h:11:9: error: cannot use keyword 'false' as enumeration constant
#12 9.104    11 |         false   = 0,
#12 9.104       |         ^~~~~
#12 9.104 ./include/linux/stddef.h:11:9: note: 'false' is a keyword with '-std=c23' onwards
#12 9.107 ./include/linux/types.h:30:33: error: 'bool' cannot be defined via 'typedef'
#12 9.107    30 | typedef _Bool                   bool;
#12 9.107       |                                 ^~~~
#12 9.108 ./include/linux/types.h:30:33: note: 'bool' is a keyword with '-std=c23' onwards
#12 9.109 ./include/linux/types.h:30:1: warning: useless type name in empty declaration
#12 9.109    30 | typedef _Bool                   bool;
#12 9.109       | ^~~~~~~
#12 9.125 make[3]: *** [scripts/Makefile.build:249: arch/x86/realmode/rm/wakemain.o] Error 1
#12 9.126 make[2]: *** [arch/x86/realmode/Makefile:22: arch/x86/realmode/rm/realmode.bin] Error 2
#12 9.126 make[2]: *** Waiting for unfinished jobs....

oh ffs here we go with bool again. Do we need a newer compiler? Why did this work on my machine?

[hugelgupf]

It's compiled using a docker image, with the dockerfile in that directory. you can update that

[hugelgupf]

the docker file uses ubuntu:rolling as the base, so it should be as up to date as ubuntu...

[hugelgupf]

in which case it's probably that the compiler is too new for the kernel version pinned there. wanna update that?