qemu-common.h: Move muldiv64() to host-utils.h

Move the muldiv64() function from qemu-common.h to host-utils.h.
This puts it together with all the other arithmetic functions
where we provide a version with __int128_t and a fallback
without, and allows headers which need muldiv64() to avoid
including qemu-common.h.

We don't include host-utils from qemu-common.h, to avoid dragging
more things into qemu-common.h than it already has; in practice
everywhere that needs muldiv64() can get it via qemu/timer.h.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>

include/qemu/timer.h

@@ -4,6 +4,7 @@
 #include "qemu/typedefs.h"
 #include "qemu-common.h"
 #include "qemu/notify.h"
+#include "qemu/host-utils.h"
 
 #define NANOSECONDS_PER_SECOND 1000000000LL