Drop the cryptolib SHA implementation and use the faster and much smaller SHA
implementation from lib/.  Saves about 5K.  This also saves time by doing one
memset per update call rather than one per SHA block.
Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>