Bugfix: create the directory for storing the restart state (Thanks hjem)

fixes #1303

include/ipc.h

@@ -50,6 +50,12 @@ typedef void(*handler_t)(int, uint8_t*, int, uint32_t, uint32_t);
                                      int size, uint32_t message_size, \
                                      uint32_t message_type)
 
+/**
+ * Emulates mkdir -p (creates any missing folders)
+ *
+ */
+bool mkdirp(const char *path);
+
 /**
  * Handler for activity on the listening socket, meaning that a new client
  * has just connected and we should accept() him. Sets up the event handler