Description: Shows a list with available CPU architectures of the sources list, in case that the wanted architecture is not available in the sources list. The alternative architecture will be written to the arch option of the client.
Parameter:
sourceName: The name of the package source list.
wantedArch: The CPU architecture of the m23 client.
client: Name of the client.
Returns:
: A CPU architecture supported by the package source list.
