PR python/12227

	* NEWS: Mention -data-directory.
	* main.c (captured_main): Recognize -data-directory.

	doc/
	* gdb.texinfo (Mode Options): Document -data-directory.
	(Data Files): Add reference to -data-directory.

	testsuite/
	* gdb.base/catch-syscall.exp (do_syscall_tests): Remove setting
	of data-directory.
	* lib/gdb-python.exp (gdb_check_python_config): Delete, all callers
	updated.
	* lib/gdb.exp (INTERNAL_GDBFLAGS): Add -data-directory.