sysemu: avoid proliferation of include/ subdirectories

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/slirp.c b/slirp.c
index e82b7c9..e6a26c4 100644
--- a/slirp.c
+++ b/slirp.c
@@ -23,7 +23,7 @@
  */
 #include "qemu-common.h"
 #include "qemu/timer.h"
-#include "char/char.h"
+#include "sysemu/char.h"
 #include "slirp.h"
 #include "hw/hw.h"