[5.9] Relax FileCheck directives for skip_clean_llbuild.test

[edymtt]

This is needed short term to allow the test to pass when running on Python 3.11 and later and avoid errors like

<stdin>:44:1: note: non-matching line after previous match is here
<string>:1: DeprecationWarning: 'pipes' is deprecated and slated for removal in Python 3.13
^

Long term we want to replace uses of the obsolete pipes.quotes function with shlex.quotes.

Addresses rdar://109664710

(cherry picked from commit 1534925,
#66062)

[edymtt]

@swift-ci please test

[edymtt]

@swift-ci please test Apple Silicon

[edymtt]

@swift-ci please build toolchain

[edymtt]

On Apple Silicon skip_clean_llbuild is now passing, the only failure is unrelated to this PR

******************** TEST 'Swift(macosx-arm64) :: Python/python_lint.swift' FAILED ********************
Script:
--
: 'RUN: at line 8';   /Applications/Xcode.app/Contents/Developer/usr/bin/python3 /Users/ec2-user/jenkins/workspace/swift-pr-arm64-macos/branch-release/5.9/swift/utils/python_lint.py
--
Exit Code: 1

Command Output (stdout):
--

The flake8 and flake8-import-order Python packages are required for linting,
but these were not found on your system.

You can install these using:

    python3 -m pip install flake8
    python3 -m pip install flake8-import-order

For more help, see http://flake8.pycqa.org.


--
...
Failed Tests (1):
  Swift(macosx-arm64) :: Python/python_lint.swift

[edymtt]

@swift-ci please test Apple Silicon

[edymtt]

The Apple Silicon bot is failing testing llbuild, passing the critical point

...
PASS: Swift-validation(macosx-arm64) :: BuildSystem/skip_clean_llbuild.test (9147 of 16275)
...
Failed Tests (1):
  llbuild :: SwiftBuildTool/swift-compiler-whole-module-optimization.swift-build

[hamishknight]

swiftlang/swift-llbuild#880

@swift-ci please test Apple Silicon