net: Drop unneeded Windows headers in compat.h

No interface from the mswsock.h header is used.
According to https://docs.microsoft.com/en-us/windows/win32/winsock/creating-a-basic-winsock-application
"The Winsock2.h header file internally includes core elements from
the Windows.h header file, so there is not usually an #include line
for the Windows.h header file in Winsock applications."

src/compat.h

@@ -18,11 +18,7 @@
 #undef FD_SETSIZE // prevent redefinition compiler warning
 #endif
 #define FD_SETSIZE 1024 // max number of fds in fd_set
-
-#include <winsock2.h>     // Must be included before mswsock.h and windows.h
-
-#include <mswsock.h>
-#include <windows.h>
+#include <winsock2.h>
 #include <ws2tcpip.h>
 #include <stdint.h>
 #else