mdns_cpp: Compile error when building with MSYS2/MINGW.

[mayd]

When I try to build mdns_cpp on Windows with MSYS2/MINGW it fails with the following output:

$ cmake --build .
[ 10%] Building CXX object CMakeFiles/mdns_cpp.dir/src/logger.cpp.obj
[ 20%] Building CXX object CMakeFiles/mdns_cpp.dir/src/mdns.cpp.obj
C:\msys64\home\david\projects\mdns_cpp-master\src\mdns.cpp: In member function 'int mdns_cpp::mDNS::openServiceSockets(int*, int)':
C:\msys64\home\david\projects\mdns_cpp-master\src\mdns.cpp:38:26: error: 'in4addr_any' was not declared in this scope; did you mean 'in6addr_any'?
   38 |     sock_addr.sin_addr = in4addr_any;
      |                          ^~~~~~~~~~~
      |                          in6addr_any
mingw32-make[2]: *** [CMakeFiles\mdns_cpp.dir\build.make:91: CMakeFiles/mdns_cpp.dir/src/mdns.cpp.obj] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:88: CMakeFiles/mdns_cpp.dir/all] Error 2
mingw32-make: *** [Makefile:135: all] Error 2

The following patch removed the error and the mdns_cpp build succeeded. And the example programs seem to work as expected.

--- mdns.cpp.original 2022-09-07 14:22:48.000000000 +0800
+++ mdns.cpp  2023-08-10 21:23:03.502663800 +0800
@@ -35,7 +35,7 @@
     sockaddr_in sock_addr{};
     sock_addr.sin_family = AF_INET;
 #ifdef _WIN32
-    sock_addr.sin_addr = in4addr_any;
+    sock_addr.sin_addr.s_addr = INADDR_ANY;
 #else
     sock_addr.sin_addr.s_addr = INADDR_ANY;
 #endif