apropos uses foldl but does not state the correct chicken dependency

[Christian Kellermann]

Users try to install the apropos egg with older (< 4.8.0) chickens and are confused about the error message they get:

Warning: reference to possibly unbound identifier `foldl' in:
Warning:    environment-list-symbols

Error: module unresolved: apropos

Error: shell command terminated with non-zero exit status 256: /home/ckellerm/chickens/4.7.0/bin/chicken apropos.scm -output-file apropos.c -dynamic -featu...

Maybe it will make it clearer to add the chicken version to the depends clause in the .meta file or provide a workaround for foldl for older chickens?

[Kon Lovett]

Checks for CHICKEN 4.4 & doesn't use foldl. Will not install unless >= 4.4