This patch enables the fexec-charset option to control the execution charset of string literals. It sets the default internal charset, system charset, and execution charset for z/OS and UTF-8 for all other platforms.
(cherry picked from commit 0295d0da4db8b8fcd54084dc6ae95d8b0bbf45d9)
(cherry picked from commit e379f6cb9d063cb78c6b48b0e0a8d9f241958f89)