Fixed leaks. Other leaks are originated in libgd.

ext/gd/gd.c

@@ -320,7 +320,7 @@ zend_module_entry gd_module_entry = {
 	PHP_MINIT(gd),
 	NULL,
 	NULL,
-	NULL,
+	PHP_RSHUTDOWN(gd),
 	PHP_MINFO(gd),
 	NO_VERSION_YET,
 	STANDARD_MODULE_PROPERTIES
@@ -412,6 +412,17 @@ PHP_MINIT_FUNCTION(gd)
 }
 /* }}} */
 
+/* {{{ PHP_RSHUTDOWN_FUNCTION
+ */
+PHP_RSHUTDOWN_FUNCTION(gd)
+{
+#if HAVE_LIBGD20
+	gdFreeFontCache();
+#endif
+	return SUCCESS;
+}
+/* }}} */
+
 /* {{{ PHP_MINFO_FUNCTION
  */
 PHP_MINFO_FUNCTION(gd)

ext/gd/php_gd.h

@@ -58,6 +58,7 @@ extern zend_module_entry gd_module_entry;
 PHP_MINFO_FUNCTION(gd);
 PHP_MINIT_FUNCTION(gd);
 PHP_MSHUTDOWN_FUNCTION(gd);
+PHP_RSHUTDOWN_FUNCTION(gd);
 
 PHP_FUNCTION(gd_info);
 PHP_FUNCTION(imagearc);