WL#13220: Deprecate --character-set-client-handshake server option

Added a deprecation warning.
Added test.

WL#8609: Deprecate old/new system variables

Added a deprecation warning on command line and SET GLOBAL
Added test

WL#11091: Deprecate mysql_ssl_set() C API function
Marked mysql_ssl_set() as deprecated using the C++14 macro
Removed use of it from the mysql codebase.

Post-push fix: Fix for issue reported by linktest

Change-Id: I7d329c47c0a0a9ef4710215531dec72b59fd8812

Author: harinvadodaria

include/mysql.h

@@ -457,7 +457,7 @@ const char *STDCALL mysql_character_set_name(MYSQL *mysql);
 int STDCALL mysql_set_character_set(MYSQL *mysql, const char *csname);
 
 MYSQL *STDCALL mysql_init(MYSQL *mysql);
-#ifdef __cplusplus
+#if defined(__cplusplus) && (__cplusplus >= 201402L)
 [[deprecated("Use mysql_options() instead.")]]
 #endif
 bool STDCALL