It's not "Windows vs. (Linux or OS X or Cygwin)", it's "Windows vs. UN*X".

Either it's Windows and not Cygwin (__WIN32 suffices for both 32-bit and
64-bit Windows, and this code is unlikely to work on 16-bit Windows, not
that much of anybody cares about it any more), or it's UN*X or Windows-
pretending-to-be-UN*X-with-Cygwin.  That way we don't have to pile on
new defined(XXX)'s for every UN*X out there.

Change-Id: Ia1df3378a88f2cf8bd1cc8f1a74b51adfe668370
Reviewed-on: https://code.wireshark.org/review/8016
Reviewed-by: Guy Harris <guy@alum.mit.edu>

extcap/androiddump.c

@@ -48,7 +48,7 @@
     #include "wsutil/wsgetopt.h"
 #endif
 
-#if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64))
+#if defined(__WIN32) && !defined(__CYGWIN__)
     #ifdef HAVE_WINDOWS_H
         #include <windows.h>
     #endif
@@ -58,8 +58,10 @@
     #ifdef HAVE_WINSOCK2_H
         #include <winsock2.h>
     #endif
-#endif
-#if (defined(__linux__) || defined(__APPLE__) || defined(__CYGWIN__))
+#else
+    /*
+     * UN*X, or Windows pretending to be UN*X with the aid of Cygwin.
+     */
     #include <arpa/inet.h>
 
     #define closesocket(socket)  close(socket)