[gdb/testsuite] Drop tclsh dependency

The test-case gdb.tui/tuiterm-2.exp uses a tcl script gdb.tcl that uses tclsh
as its interpreter:
...
 #!/usr/bin/env tclsh
...

I used tclsh because I assumed it was an existing dependency of
dejagnu/expect, but apparently [1] that's not the case.

IWBN to use some existing dependency instead.

Using expect instead of tclsh also works on my system, but looking in
/usr/bin/runtest I realized that someone might have a dejagnu setup with
a custom expect indicated by setting an env var EXPECT.  So to find expect
we'd have to mimic whatever runtest is doing to find expect, or do:
...
$ runtest --version -v | grep "Expect binary"
...
using the appropriate runtest.

That sounds non-trivial and fragile, so simply use a shell script with /bin/sh
interpreter instead.

Tested on x86_64-linux.

Approved-By: Tom Tromey <tom@tromey.com>

[1] https://sourceware.org/pipermail/gdb-patches/2025-September/220736.html

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