virutil.c: do not include ioctl.h

Added by commit 61674cc1, but we have started using
set_nonblocking_flag from gnulib in commit da3c4714Signed-off-by: NJán Tomko <jtomko@redhat.com>

src/util/virutil.c

@@ -42,7 +42,6 @@
 #endif
 
 #include <sys/types.h>
-#include <sys/ioctl.h>
 #include <string.h>
 #include <termios.h>