[PATCH] missing include of config.h in asm-alpha/page.h

That was a nasty one - missing include of config.h in a file that has
non-trivial ifdefs.  With some configs it ended up with very odd conflicts
(we get included early, take the wrong branch of ifdef, then get another
file included, it pulls in config.h and picks the right branch of its
ifdef; surprise, surprise, they conflict).
Signed-off-by: Al Viro <viro@parcelfarce.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-alpha/page.h

 #ifndef _ALPHA_PAGE_H
 #define _ALPHA_PAGE_H
 
+#include <linux/config.h>
 #include <asm/pal.h>
 
 /* PAGE_SHIFT determines the page size */