Makefile: add compat/bswap.h to LIB_H

Starting with commit 51ea55190b,
git-compat-util.h includes compat/bswap.h

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -412,6 +412,7 @@ LIB_H += builtin.h
 LIB_H += cache.h
 LIB_H += cache-tree.h
 LIB_H += commit.h
+LIB_H += compat/bswap.h
 LIB_H += compat/cygwin.h
 LIB_H += compat/mingw.h
 LIB_H += csum-file.h