Build c_mqtt/stm32 - part 1, with stubs

PUBLISHED_FROM=de4b9f3e9eeafa75bb8919abacd86fb23fdefc1b

mongoose.h

@@ -933,9 +933,12 @@ typedef struct stat cs_stat_t;
 #include <string.h>
 #include <time.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
 #include <stdio.h>
 
 typedef struct stat cs_stat_t;
+#define DIRSEP '/'
 
 #ifndef CS_ENABLE_STDIO
 #define CS_ENABLE_STDIO 1
@@ -979,6 +982,8 @@ typedef int sock_t;
 const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
 char *inet_ntoa(struct in_addr in);
 int inet_pton(int af, const char *src, void *dst);
+int inet_aton(const char *cp, struct in_addr *inp);
+in_addr_t inet_addr(const char *cp);
 
 #endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK */