MFC r257302 (by rea):

binutils/bfd: fix printf-like format strings for "bfd *" arguments

There is a special format argument '%B' that directly handles values
of type 'bfd *', they must be used instead of '%s'. Manifestations
of this bug can be seen in ld(1) error messages, for example,

http://lists.freebsd.org/pipermail/freebsd-current/2013-August/043580.html
http://lists.freebsd.org/pipermail/freebsd-current/2013-October/045404.html

Approved by: dim

MFC r275386:

Let GNU ld be less obscure about missing symbols and DSOs. If the BFD
object looks like a typical shared library, suggest adding '-l<foo>',
where <foo> has the 'lib' prefix and '.so<bar>' or '.a' suffix removed.

Otherwise, suggest adding '-l:<foo>', where <foo> is the full DT_SONAME.

Submitted by: Conrad Meyer <conrad.meyer@isilon.com>
Sponsored by: EMC / Isilon storage division
Reviewed by: emaste
PR: 194296
Differential Revision: https://reviews.freebsd.org/D1152