bug#24433: fish needs to have bc in propagated-inputs

[Arun Isaac]

'fish' needs 'bc' as a propagated input. I have noticed runtime errors
due to absence of bc. It's also mentioned here:

https://github.com/fish-shell/fish-shell#runtime-dependencies

Quoting the relevant paragraph:

"fish requires a number of utilities to operate, which should be present
on any Unix, GNU/Linux or OS X system. These include (but are not
limited to) hostname, grep, awk, sed, which, and getopt. fish also
requires the bc program."

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