kdrive: don't include <err.h> anymore

We don't need it at all (and even shouldn't use it), and this breaks
the win32/mingw build.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

hw/kdrive/ephyr/hostx.c

@@ -31,7 +31,6 @@
 #include <string.h>             /* for memset */
 #include <errno.h>
 #include <time.h>
-#include <err.h>
 #include <sys/ipc.h>
 #include <sys/shm.h>
 #include <sys/time.h>