SITL: add missing header for timeval struct on alpine linux

libraries/SITL/SIM_GPS.cpp

@@ -11,6 +11,7 @@
 #if HAL_SIM_GPS_ENABLED
 
 #include <time.h>
+#include <sys/time.h>
 
 #include <AP_BoardConfig/AP_BoardConfig.h>
 #include <AP_HAL/AP_HAL.h>

libraries/SITL/SIM_GPS.h

@@ -27,6 +27,7 @@ param set SERIAL5_PROTOCOL 5
 
 #if HAL_SIM_GPS_ENABLED
 
+#include <sys/time.h>
 #include "SIM_SerialDevice.h"
 
 namespace SITL {

libraries/SITL/SIM_GPS_MSP.cpp

@@ -7,6 +7,7 @@
 #include <SITL/SITL.h>
 
 #include <time.h>
+#include <sys/time.h>
 
 using namespace SITL;
 

libraries/SITL/SIM_GPS_NMEA.cpp

@@ -9,6 +9,7 @@
 #include <AP_HAL/AP_HAL.h>
 
 #include <time.h>
+#include <sys/time.h>
 
 extern const AP_HAL::HAL& hal;
 

libraries/SITL/SIM_MicroStrain.cpp

@@ -25,6 +25,7 @@
 */
 #include "SIM_MicroStrain.h"
 #include <stdio.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <AP_HAL/utility/sparse-endian.h>

libraries/SITL/SIM_MicroStrain.h

@@ -6,6 +6,7 @@
 
 #include <SITL/SITL.h>
 #include "SIM_SerialDevice.h"
+#include <sys/time.h>
 
 namespace SITL
 {

libraries/SITL/SIM_VectorNav.cpp

@@ -18,6 +18,7 @@
 
 #include "SIM_VectorNav.h"
 #include <stdio.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <AP_Common/NMEA.h>