Add align to struct mg_iobuf

src/iobuf.h

@@ -6,10 +6,11 @@ struct mg_iobuf {
   unsigned char *buf;  // Pointer to stored data
   size_t size;         // Total size available
   size_t len;          // Current number of bytes
+  size_t align;        // Alignment during allocation
 };
 
-int mg_iobuf_init(struct mg_iobuf *, size_t);
+int mg_iobuf_init(struct mg_iobuf *, size_t, size_t);
 int mg_iobuf_resize(struct mg_iobuf *, size_t);
 void mg_iobuf_free(struct mg_iobuf *);
-size_t mg_iobuf_add(struct mg_iobuf *, size_t, const void *, size_t, size_t);
+size_t mg_iobuf_add(struct mg_iobuf *, size_t, const void *, size_t);
 size_t mg_iobuf_del(struct mg_iobuf *, size_t ofs, size_t len);