slirp: remove unused header

Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>

slirp/slirp.h

 #ifndef SLIRP_H
 #define SLIRP_H
 
-#include "qemu/host-utils.h"
 #include "slirp_config.h"
 
 #ifdef _WIN32