Fix a compile failure


BitKeeper/deleted/.del-protocol_cursor.cc~2a1ab8e023a166a4:
  Delete: sql/protocol_cursor.cc
VC++Files/libmysqld/libmysqld.dsp:
  Remove protocol_cursor.cpp (no longer used) from sources
VC++Files/sql/mysqld.dsp:
  Remove protocol_cursor.cpp (no longer used) from sources
sql/mysqld.cc:
  Fix a compile failure