Linux 2.6.19-rc4

Not halloween. Not scary. Just a regular -rc release.
diff --git a/Makefile b/Makefile
index 25b3599..9557619 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 19
-EXTRAVERSION =-rc3
+EXTRAVERSION =-rc4
 NAME=Avast! A bilge rat!
 
 # *DOCUMENTATION*