databases/mysql56-server: unbreak build with Clang 6 (C++14 by default)

sql-common/client_authentication.cc:87:56: error: comparison between pointer and integer ('char *' and 'int')
      mysql->options.extension->server_public_key_path != '\0')
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~

sql/sql_trigger.cc:195:5: error:
      non-constant-expression cannot be narrowed from type 'int' to 'size_t' (aka 'unsigned long') in
      initializer list [-Wc++11-narrowing]
    static_cast<int>(my_offsetof(class Table_triggers_list, definitions_list)),
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reported by:	antoine (via bug 224669)

1 files changed, 17 insertions, 0 deletions

diff --git a/databases/mysql56-client/files/patch-sql-common_client__authentication.cc b/databases/mysql56-client/files/patch-sql-common_client__authentication.cc
new file mode 100644
index 000000000000..fdbf5eb98562
--- /dev/null
+++ b/databases/mysql56-client/files/patch-sql-common_client__authentication.cc
@@ -0,0 +1,17 @@
+sql-common/client_authentication.cc:87:56: error: comparison between pointer and integer ('char *' and 'int')
+      mysql->options.extension->server_public_key_path != '\0')
+      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~
+
+Part of https://github.com/mysql/mysql-server/commit/db1bde79b1b4
+
+--- sql-common/client_authentication.cc.orig	2017-09-13 15:49:17 UTC
++++ sql-common/client_authentication.cc
+@@ -84,7 +84,7 @@ RSA *rsa_init(MYSQL *mysql)
+ 
+   if (mysql->options.extension != NULL &&
+       mysql->options.extension->server_public_key_path != NULL &&
+-      mysql->options.extension->server_public_key_path != '\0')
++      mysql->options.extension->server_public_key_path[0] != '\0')
+   {
+     pub_key_file= fopen(mysql->options.extension->server_public_key_path,
+                         "r");