No need to specify $(package)_download_file
when it is equal to $(package)_file_name
.
Historically, before bitcoin/bitcoin#19817, distinct $(package)_download_file
and $(package)_file_name
were used for better portability (I guess) by removing +
characters from a file name.
The only package which still use file renaming is native_capnp
: https://github.com/bitcoin/bitcoin/blob/eca694a4e78d54ce4e29b388b3e81b06e55c2293/depends/packages/native_capnp.mk#L3-L5