Remove x86/generic target

[Stefan Lippers-Hollmann]

Hi

On 2025-05-01, Hauke Mehrtens wrote:
> Hi,
> 
> We would like to remove the 32 bit x86/generic target. The target is 
> still working, but we could save some build resources.
[...]
> We would also keep the x86/legacy and the x86/geode target. We can 
> activate some extra kernel build options if it can not replace 
> x86/generic with the current configuration.

It would probably make sense to merge legacy and geode into a single
32 bit x86 subtarget as well. I can't imagine that there is enough of 
an advantage in /x86/ mach fine tuning to warrant multiple dedicated 
subtargets. It's just unnecessary churn both on the buildbots and the
human resources to rebase the configs for new kernels.

Don't get me wrong, I'm not at all advocating for dropping 32 bit
x86 support, just to merge it into a single target for all 32-bit
x86 devices.

Just to feed my own curiosity, it would be interesting to hear what 
kind of 32 bit x86 devices are still in active use with OpenWrt today.
(Considering that the more modern 64 bit AMD Jaguar cores just barely 
reach 1 GBit/s routing+NAT throughput, while mt7621, ipqXXxx, mt7622,
filogic, etc. should be faster in this capacity than any semi power 
efficient 32 bit x86 hardware; Atom n270 (<<600 MBit/s) is still 
~25-30 watts idle, P4/ K7 around the 100 watts mark +/- 30% depending 
on the details, anything low-power should be even slower than the N270).

Regards
	Stefan Lippers-Hollmann
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