Don't include winsock2.h in xmllint.c

I'm not sure why xmllint.c did include winsock2.h at all. Stop
including the header as both MinGW and MSVC builds don't seem to
require it.

xmllint.c

@@ -12,14 +12,6 @@
 #include <stdarg.h>
 #include <assert.h>
 
-#if defined (_WIN32) && !defined(__CYGWIN__)
-#if defined (_MSC_VER) || defined(__BORLANDC__)
-#include <winsock2.h>
-#pragma comment(lib, "ws2_32.lib")
-#define gettimeofday(p1,p2)
-#endif /* _MSC_VER */
-#endif /* _WIN32 */
-
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #endif
@@ -27,12 +19,6 @@
 #include <time.h>
 #endif
 
-#ifdef __MINGW32__
-#define _WINSOCKAPI_
-#include <wsockcompat.h>
-#include <winsock2.h>
-#endif
-
 #ifdef HAVE_SYS_TIMEB_H
 #include <sys/timeb.h>
 #endif