Linux 2.6.21-rc7

I tend to prefer to not have to cut an -rc7, but we still have some
network device driver and suspend issues. So here's -rc7.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Makefile

 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 21
-EXTRAVERSION = -rc6
+EXTRAVERSION = -rc7
 NAME = Nocturnal Monster Puppy
 
 # *DOCUMENTATION*