g10,tools: Fix bzlib.h include order.

* g10/compress-bz2.c: Include bzlib.h after gcrypt.h.
* tools/gpgsplit.c: Likewise.

bzlib.h may include windows.h on Windows. It is better
after gcrypt.h which may include winsock2.h.

• Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>