fix compile failure (which shows up in cygwin environment)

server-tools/instance-manager/mysql_connection.cc:
  fix pragma statement
server-tools/instance-manager/user_map.cc:
  fix pragma statement

server-tools/instance-manager/mysql_connection.cc

@@ -15,7 +15,7 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
 #if defined(__GNUC__) && defined(USE_PRAGMA_IMPLEMENTATION)
-#pragma interface
+#pragma implementation
 #endif
 
 #include "mysql_connection.h"

server-tools/instance-manager/user_map.cc

@@ -15,7 +15,7 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
 #if defined(__GNUC__) && defined(USE_PRAGMA_IMPLEMENTATION)
-#pragma interface
+#pragma implementation
 #endif
 
 #include "user_map.h"