linux(4): Get rid of Linuxulator's kernel build options.

[dchagin]

Summary

Stop confusing people and retire COMPAT_LINUX and COMPAT_LINUX32 kernel
build options. Since we have 64-bit Linux emulation we can't build both
emulators into the kernel. And I don't think it matters, Linux emulation
depends on loadable modules (via rc).

Cut LINPROCFS and LINSYSFS for consistency.

I haven't removed opt_compat.h, maybe we should as there no any COMPAT
option left.

PR: 215061
MFC after: 2 weeks

[rpokala]

To make sure I understand this: this change is to no longer allow Linuxulator to be built into the kernel, and only allow it to be built as a module?

share/man/man4/tdfx.4

52–56

By loading the

56

modules, you can enable the linux ioctl code for this driver, where the only supported

sys/amd64/conf/NOTES

263–264

"both" what? I think you mean

# To enable Linuxulator support, one must also load linux.ko and tdfx_linux.ko

Is that correct?

sys/i386/conf/NOTES

432

# To enable Linuxulator support, load tdfx and tdfx_linux as modules.

The i386 and amd64 versions of this comment should match; I think this version is clearer.

[dchagin]

fixed Ravi's comments. thanks!

[dchagin]

In D30751#691414, @rpokala wrote:

To make sure I understand this: this change is to no longer allow Linuxulator to be built into the kernel, and only allow it to be built as a module?

yes, you are right

sys/amd64/conf/NOTES

263–264

sentence correct, but I removed it as amd64 does not support tdfx, and fixed this sentence for i386 NOTES. thanks)

[bcr]

OK for the manpage part of the change. You need to bump the .Dd for this content change when you commit.