The header logic for pulling in ELF defines mixes common ELF headers and

The header logic for pulling in ELF defines mixes common ELF headers and
target specific headers.  In the Blackfin case, we always want to pull in
the bfin.h since most of the time, the common ELF headers do not have our
relocation defines.  This fixes building for mingw targets.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>