Reads a token list from the configuration file.
Reads a token list (words separated by spaces) from the current config
file. The token list is stored in a temporary buffer that will be clobbered
by the next call to get_config_argv(), so the data should not be expected
Returns an argv style argument list and sets `argc' to the number of
retrieved tokens. If the variable is not present, returns NULL and sets
argc to zero.
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