[Libreoffice] management of files in src/

Hullo List,

The files that get downloaded and placed in the src/ directory, 
resembling something akin to:

>   63ddc5116488985e820075e65fbe6aa4-openssl-0.9.8o.tar.gz
>   09357cc74975b01714e00c5899ea1881-pixman-0.12.0.tar.gz
>   0b49ede71c21c0599b0cc19b353a6cb3-README_apache-commons.txt

Do we have a mechanism for automatically removing unused/old external 
sources from the src/ directory?

I think it's a cute idea to have the md5sums in the name, but short of 
some "cut -b34- | sort" command line foo, it makes seeing what cruft I 
have in that directory take 1 minute instead of 30 seconds.  (Yes, I'm 
lazy.)

Cheers,

Kevin