The emergence of so-called "dot releases" that are non-incremental patches
against a base kernel requires different handling of patches (revert
previous patches before applying the newest one).  This patch adds a
paragrach to $TOPDIR/README explaining how to do deal with dot release
patches.

Signed-off-by: Kurt Wall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>