Add futimens() implementation for _WIN32

* src/wget.c: Add futimens() if _WIN32 is defined

Reported-by: Gisle Vanem
Fixes: #167

src/wget.c

@@ -2347,6 +2347,33 @@ static time_t G_GNUC_WGET_NONNULL_ALL get_file_mtime(const char *fname)
 	return 0;
 }
 
+#ifdef _WIN32
+#include <windows.h>
+
+int futimens(int fd, const struct timespec times[2])
+{
+	FILETIME mt, at;
+	LONGLONG ll;
+
+	// convert time_t to FILETIME
+	ll = Int32x32To64(times[0].tv_sec, 10000000) + 116444736000000000;
+	at.dwLowDateTime = (DWORD) ll;
+	at.dwHighDateTime = ll >> 32;
+
+	ll = Int32x32To64(times[1].tv_sec, 10000000) + 116444736000000000;
+	mt.dwLowDateTime = (DWORD) ll;
+	mt.dwHighDateTime = ll >> 32;
+
+	BOOL success = SetFileTime(
+		(HANDLE) _get_osfhandle (fd),
+		&mt,  // creation
+		&at,  // last access
+		&mt); // last modification
+
+	return success ? 0 : -1;
+}
+#endif
+
 static void set_file_mtime(int fd, time_t modified)
 {
 	struct timespec timespecs[2]; // [0]=last access  [1]=last modified