[RFC] README: Update Linux version requirement to 2.3.31.

[Alexandre Julliard]

Akihiro Sagawa <sagawa.aki at gmail.com> writes:

> I've not tested the version, but recent commit 45a632ee81c9c5c58309426de5aadbd8dbbba0f5
> introduces SYS_mmap2 system call which doesn't exist before 2.3.31.
> So, should we update the requirement? Is 2.3.31 valid enough?

I'm not sure that we know what the minimum version is these days. If
mmap2 is really the only new dependency, adding a workaround is easy
enough. Is anybody able to test this?

-- 
Alexandre Julliard
julliard at winehq.org