Fix pthreads building on Windows

src/thread.c

@@ -2,8 +2,13 @@
 #include <stdio.h>
 #include <time.h>
 #include <pthread.h>
+#ifndef _MSC_VER
 #include <sys/param.h>
 #include <unistd.h>
+#endif
+#ifdef _WIN32
+#include <windows.h>
+#endif
 #include <inttypes.h>
 #include <86box/86box.h>
 #include <86box/plat.h>
@@ -103,6 +108,17 @@ thread_wait_event(event_t *handle, int timeout)
     event_pthread_t *event = (event_pthread_t *)handle;
     struct timespec abstime;
 
+#ifdef _MSC_VER
+    /* Taken from https://stackoverflow.com/a/31335254 with some modifications. */
+    FILETIME systime;
+    uint64_t systimeint = 0;
+    GetSystemTimeAsFileTime(&systime);
+    systimeint |= systime.dwLowDateTime;
+    systimeint |= (uint64_t)systime.dwHighDateTime << 32i64;
+    systimeint -= 116444736000000000i64;
+    abstime.tv_sec = systimeint / 10000000i64;
+    abstime.tv_nsec = systimeint % 10000000i64 * 100;
+#else
     clock_gettime(CLOCK_REALTIME, &abstime);
     abstime.tv_nsec += (timeout % 1000) * 1000000;
     abstime.tv_sec += (timeout / 1000);
@@ -110,6 +126,7 @@ thread_wait_event(event_t *handle, int timeout)
 	abstime.tv_nsec -= 1000000000;
 	abstime.tv_sec++;
     }
+#endif
 
     pthread_mutex_lock(&event->mutex);
     if (timeout == -1) {
@@ -138,7 +155,11 @@ thread_destroy_event(event_t *handle)
 void
 thread_sleep(int t)
 {
+#ifdef _WIN32
+    Sleep(t);
+#else
     usleep(t * 1000);
+#endif
 }