[mlpack-git] [mlpack] Compiling on Archlinux (#574)

[Ryan Curtin]

I also hit this on an Arch box yesterday.  The libbfd maintainers are obstinate:

https://sourceware.org/bugzilla/show_bug.cgi?id=14243
https://sourceware.org/bugzilla/show_bug.cgi?id=15920

They claim that bfd is an "internal only" library and should not be used by other projects, and use this to justify their decision to force users to define `PACKAGE` and `PACKAGE_VERSION` themselves (thereby making the check meaningless to begin with!).

I don't like it, but probably the only solution here is to define those two variables in backtrace.hpp right before bfd.h is included, and then undefine them right after bfd.h is included.

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