lwip: Changed to C linkage for fixing bug when using mixed C/C++ code
Merges
#include "lwip/netdb.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+
#ifdef ESP_PLATFORM
int getnameinfo(const struct sockaddr *addr, socklen_t addrlen,
char *host, socklen_t hostlen,
char *serv, socklen_t servlen, int flags);
#endif
+
+#ifdef __cplusplus
+}
+#endif
