#pragma once (was Re: incoming)

[Alexey Dobriyan]

Linus wrote:

> I'm hoping to just do -rc1 this weekend after all - despite my late
> start due to loss of power for several days.
> 
> I'll allow late stragglers with good reason through, but the fewer of
> those there are, the better, of course.

I want to sent treewide "#pragma once" conversion:

	18092 files changed, 18883 insertions(+), 99841 deletions(-)

ideally it is done as 1 commit avoiding my death by thousand cuts of
going through all of maintainers.

There may be a compile failure or two but the list of exceptions is
stable.

Opinions? :-)