[JFFS2] Remove obsolete histo.h

This file hasn't actually been used since the very early days of JFFS2
when Arjan was playing with compression methods. It can go now.
Signed-off-by: Domen Puncer <domen@coderock.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/histo.h

-/* This file provides the bit-probabilities for the input file */
-#define BIT_DIVIDER 629
-static int bits[9] = { 179,167,183,165,159,198,178,119,}; /* ia32 .so files */