[gdb/testsuite] Add missing skip_tui_tests

[gdb/testsuite] Add missing skip_tui_tests

When building gdb with --disable-tui, we run into:
...
(gdb) frame apply all -- -^M
Undefined command: "-".  Try "help".^M
(gdb) ERROR: Undefined command "frame apply all -- -".
UNRESOLVED: gdb.base/options.exp: test-frame-apply: frame apply all -- -
...

Fix this by detecting whether tui is supported, and skipping the tui-related
tests otherwise.  Same in some gdb.tui test-cases.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2021-07-13  Tom de Vries  <tdevries@suse.de>

	* gdb.base/options.exp: Skip tui-related tests when tui is not
	supported.
	* gdb.python/tui-window-disabled.exp: Same.
	* gdb.python/tui-window.exp: Same.