Linux 2.6.21-rc4

Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Makefile

 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 21
-EXTRAVERSION = -rc3
-NAME = Homicidal Dwarf Hamster
+EXTRAVERSION = -rc4
+NAME = Nocturnal Monster Puppy
 
 # *DOCUMENTATION*
 # To see a list of typical targets execute "make help"