Before, variables containing dollar characters displayed so wrong that it
was hard to explain.
To fix the problem, I typed almost random characters into the code until
the output was exactly as expected. I still do not understand:
* why the list variables need 8 dollars to survive the @x@ loop,
* why the code only works if the dollars come from an external variable
instead of being written inline,
* why the backslash in the :C modifier needs to be doubled.
Anyway, the output of "bmake show-all-extract" now contains the shell
variable $${extract_file}, just as it should. The dollars are now doubled
in the output and thereby match the source code from the Makefile
exactly.
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