Moving Field_blob::store_length() back from protected to public,

as it's needed for Cassandra in 10.0.

sql/field.h

@@ -1830,11 +1830,6 @@ class Field_blob :public Field_longstr {
   */
   String value;
   
-  void store_length(uchar *i_ptr, uint i_packlength, uint32 i_number);
-  inline void store_length(uint32 number)
-  {
-    store_length(ptr, packlength, number);
-  }
 public:
   Field_blob(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg,
 	     enum utype unireg_check_arg, const char *field_name_arg,
@@ -1907,6 +1902,11 @@ class Field_blob :public Field_longstr {
   int reset(void) { bzero(ptr, packlength+sizeof(uchar*)); return 0; }
   void reset_fields() { bzero((uchar*) &value,sizeof(value)); }
   uint32 get_field_buffer_size(void) { return value.alloced_length(); }
+  void store_length(uchar *i_ptr, uint i_packlength, uint32 i_number);
+  inline void store_length(uint32 number)
+  {
+    store_length(ptr, packlength, number);
+  }
   inline uint32 get_length(uint row_offset= 0)
   { return get_length(ptr+row_offset, this->packlength); }
   uint32 get_length(const uchar *ptr, uint packlength);