Include sys/param.h on UNIX (to get PATH_MAX)

PUBLISHED_FROM=774764f9d316e111912dae1fcaf2933141c59a60

mongoose.h

@@ -352,6 +352,7 @@ typedef struct _stati64 cs_stat_t;
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/param.h>
 #include <sys/socket.h>
 #include <sys/select.h>
 #include <sys/stat.h>