Merge #20221: net: compat.h related cleanup

cadb77a net: Add compat.h header for htonl function (Hennadii Stepanov)
f796f00 net: Drop unneeded headers when compat.h included (Hennadii Stepanov)
467c346 net: Drop unneeded Windows headers in compat.h (Hennadii Stepanov)

Pull request description:

  It is the `compat.h` header's job to provide platform-agnostic interfaces for internet operations.
  No need in `#include <arpa/inet.h>` scattered around.

ACKs for top commit:
  practicalswift:
    re-ACK cadb77a: patch looks even better
  laanwj:
    Code review ACK cadb77a

Tree-SHA512: 625ff90b2806310ab856a6ca1ddb6d9a85aa70f342b323e8525a711dd12219a1ecec8373ec1dca5a0653ffb11f9b421753887b25615d991ba3132c1cca6a3c6e

Author: laanwj

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

src/httpserver.cpp

@@ -33,13 +33,6 @@
 
 #include <support/events.h>
 
-#ifdef EVENT__HAVE_NETINET_IN_H
-#include <netinet/in.h>
-#ifdef _XOPEN_SOURCE_EXTENDED
-#include <arpa/inet.h>
-#endif
-#endif
-
 /** Maximum size of http request (request line + headers) */
 static const size_t MAX_HEADERS_SIZE = 8192;
 

src/net.h

@@ -33,11 +33,6 @@
 #include <memory>
 #include <condition_variable>
 
-#ifndef WIN32
-#include <arpa/inet.h>
-#endif
-
-
 class CScheduler;
 class CNode;
 class BanMan;

src/torcontrol.cpp

@@ -7,6 +7,7 @@
 
 #include <chainparams.h>
 #include <chainparamsbase.h>
+#include <compat.h>
 #include <crypto/hmac_sha256.h>
 #include <net.h>
 #include <netaddress.h>