Fix IPv4 socket binding on non-Windows systems

The IPv4 binding code was incorrectly wrapped in #ifdef _WIN32, causing
the server to fall through to IPv6 binding even when IPv4 was explicitly
requested with the -4 flag on Linux systems. This fix removes the Windows-
specific conditional around the IPv4 binding logic while keeping platform-
specific socket close calls.

Fixes the issue where pcm-sensor-server with -4 flag would fail to accept
connections from curl and wget on Linux.

Co-authored-by: rdementi <[email protected]>

Author: Copilot

src/pcm-sensor-server.cpp

@@ -1467,7 +1467,6 @@ class Server {
         int retval = 0;
 
         if (useIPv4) {
-#ifdef _WIN32
             // Use IPv4
             struct sockaddr_in serv4;
             memset(&serv4, 0, sizeof(serv4));
@@ -1479,13 +1478,16 @@ class Server {
                 if ( 1 != ::inet_pton( AF_INET, listenIP_.c_str(), &(serv4.sin_addr) ) )
                 {
                     DBG( 3, "close clientsocketFD" );
+#ifdef _WIN32
+                    closesocket(sockfd);
+#else
                     ::close(sockfd);
+#endif
                     throw std::runtime_error(std::string("Server Constructor: Cannot convert IP string ") + listenIP_ + " to IPv4 address");
                 }
             }
             socklen_t len = sizeof( struct sockaddr_in );
             retval = ::bind( sockfd, reinterpret_cast<struct sockaddr*>(&serv4), len );
-#endif
         } else {
             // Use IPv6
             struct sockaddr_in6 serv;