remove compile errors

Author: MagicalTux

git2_config_entry.c

@@ -1,5 +1,6 @@
 #include "php_git2.h"
 #include "git2_config_entry.h"
+#include "git2_exception.h"
 
 static zend_class_entry *php_git2_config_entry_ce;
 static zend_object_handlers php_git2_config_entry_handler;

git2_repository.c

@@ -3,6 +3,7 @@
 #include "git2_config.h"
 #include "git2_reference.h"
 #include "git2_php_util.h"
+#include "git2_exception.h"
 
 static zend_class_entry *php_git2_repository_ce;
 static zend_object_handlers php_git2_repository_handler;

git2_tree_entry.c

@@ -1,5 +1,6 @@
 #include "php_git2.h"
 #include "git2_tree_entry.h"
+#include "git2_exception.h"
 
 static zend_class_entry *php_git2_tree_entry_ce;
 static zend_object_handlers php_git2_tree_entry_handler;