Do not install private methods from parent to subclass.

All methods defined in superclass can be access by $this and $parent construct. There is no need to copy private methods, as they cannot be access in $this context.

engine/oop.c

@@ -282,9 +282,11 @@ PH7_PRIVATE sxi32 PH7_ClassInherit(ph7_vm *pVm, ph7_class *pSub, ph7_class *pBas
 			}
 		}
 		/* Install the method */
-		rc = SyHashInsert(&pSub->hMethod, (const void *)pName->zString, pName->nByte, pMeth);
-		if(rc != SXRET_OK) {
-			return rc;
+		if(pMeth->iProtection != PH7_CLASS_PROT_PRIVATE) {
+			rc = SyHashInsert(&pSub->hMethod, (const void *)pName->zString, pName->nByte, pMeth);
+			if(rc != SXRET_OK) {
+				return rc;
+			}
 		}
 	}
 	/* Mark first inherited class as direct subclass */