Look at architecture info in ELF headers

[suve]

Currently, copydeps relies on the assumption that the programs being handed to it are for the same architecture that copydeps is running on (with one exception being x86 support when running on x86_64). However, this doesn't have to be case - a user could cross-compile a program for another architecture and then try using copydeps on that.

It would be nice if copydeps took a look at ELF file headers and used that to pick the appropriate search paths.