Clean up legacy code

src/msvc/getopt.c

@@ -49,6 +49,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#define WIN32_LEAN_AND_MEAN
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>

src/msvc/gettimeofday.c

@@ -3,6 +3,7 @@
 * This file is part of the mingw-w64 runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
+#define WIN32_LEAN_AND_MEAN
 #include <time.h>
 #include <sys/time.h>
 #include <sys/timeb.h>

src/msvc/sys/time.h

@@ -19,6 +19,19 @@
 #ifndef _TIME_H_
 #define _TIME_H_
 
+// If you need both <windows.h> and <sys/time.h>,
+// make sure you include <windows.h> first.
+#ifndef _WINSOCKAPI_
+#ifndef _TIMEVAL_DEFINED
+#define _TIMEVAL_DEFINED
+struct timeval
+{
+    long tv_sec;
+    long tv_usec;
+};
+#endif /* _TIMEVAL_DEFINED */
+#endif /* _WINSOCKAPI_ */
+
 struct timezone
 {
     int tz_minuteswest;