[sr-dev] new compiler warnings in master

[Juha Heinanen]

CC (gcc) [M db_mysql.so]		my_cmd.o
my_cmd.c: In function 'set_field':
my_cmd.c:774:16: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
  bind->is_null = &f->is_null;
                ^
my_cmd.c: In function 'bind_result':
my_cmd.c:1004:21: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
   result[i].is_null = &f->is_null;
                     ^