chore(agent): include header file

Author: hahuja2

agent/fw_cakephp.c

@@ -4,6 +4,7 @@
  */
 
 #include "php_agent.h"
+#include "php_error.h"
 #include "php_execute.h"
 #include "php_user_instrument.h"
 #include "php_wrapper.h"