Hide error message about `basic_functions_module` symbol

[Adam]

phpspy/phpspy.c

Lines 522 to 524 in 450a98e

 if (get_symbol_addr(&memo, target->pid, "basic_functions_module", &target->basic_functions_module_addr) != 0) { 
     target->basic_functions_module_addr = 0; 
 } 

This will always error for PHP binaries built without debug symbols. It may confuse end users.