Commits on Jan 5, 2024

1. [libcxx] Require qemu-system-arm for armv7m builder …

   And add a check in the python script that the binary given to
   `--qemu` actually exists. Otherwise you get a generic Python error:
   ```
    # .---command stderr------------
    # | Traceback (most recent call last):
    # |   File "/home/david.spickett/modules-llvm-project/libcxx/utils/qemu_baremetal.py", line 70, in <module>
    # |     exit(main())
    # |   File "/home/david.spickett/modules-llvm-project/libcxx/utils/qemu_baremetal.py", line 66, in main
    # |     os.execvp(qemu_commandline[0], qemu_commandline)
    # |   File "/usr/lib/python3.8/os.py", line 568, in execvp
    # |     _execvpe(file, args)
    # |   File "/usr/lib/python3.8/os.py", line 610, in _execvpe
    # |     raise last_exc
    # |   File "/usr/lib/python3.8/os.py", line 601, in _execvpe
    # |     exec_func(fullname, *argrest)
    # | FileNotFoundError: [Errno 2] No such file or directory
    # `-----------------------------
    # error: command failed with exit status: 1
   ```
   When it tries to run the entire command later.
   
   For the builder, it's only ever going to use qemu-system-arm
   so error at config time if it's not there.

   

   DavidSpickett committed Jan 5, 2024
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