Fixes almost all the logging options which were previously broken

src/device/isartc.c

@@ -64,12 +64,14 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING  IN ANY  WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <string.h>
 #include <stdlib.h>
 #include <time.h>
 #include <wchar.h>
+#define HAVE_STDARG_H
 #include <86box/86box.h>
 #include "cpu.h"
 #include <86box/timer.h>