Remove pre-2.2 Linux kernel support

[Joseph S. Myers]

On Mon, 14 May 2012, Andreas Jaeger wrote:

> Please add a NEWS entry stating that pre-2.2 Linux kernel support was 
> removed.

I've added:

* Compatibility code for Linux kernel versions before 2.2 has been removed.
  Note that glibc is not expected to work with any Linux kernel version
  before 2.6.

If pre-2.4 removal also gets in before 2.16 then obviously this will 
change to refer to 2.4 instead of 2.2.  (I don't propose removing 2.4 and 
2.5 support until after 2.16 is released.)

-- 
Joseph S. Myers
joseph@codesourcery.com