scripts: remove dead file

scripts/test-driver.py was used when "make check" was already using meson
introspection data, but it did not execute "meson test".  It is dead since
commit 3d2f73ef ("build: use "meson test" as the test harness", 2021-12-23).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/test-driver.py

-#! /usr/bin/env python3
-
-# Wrapper for tests that hides the output if they succeed.
-# Used by "make check"
-#
-# Copyright (C) 2020 Red Hat, Inc.
-#
-# Author: Paolo Bonzini <pbonzini@redhat.com>
-
-import subprocess
-import sys
-import os
-import argparse
-
-parser = argparse.ArgumentParser(description='Test driver for QEMU')
-parser.add_argument('-C', metavar='DIR', dest='dir', default='.',
-                    help='change to DIR before doing anything else')
-parser.add_argument('-v', '--verbose', dest='verbose', action='store_true',
-                    help='be more verbose')
-parser.add_argument('test_args', nargs=argparse.REMAINDER)
-
-args = parser.parse_args()
-os.chdir(args.dir)
-
-test_args = args.test_args
-if test_args[0] == '--':
-    test_args = test_args[1:]
-
-if args.verbose:
-    result = subprocess.run(test_args, stdout=None, stderr=None)
-else:
-    result = subprocess.run(test_args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-    if result.returncode:
-        sys.stdout.buffer.write(result.stdout)
-sys.exit(result.returncode)