classes/binconfig.bbclass: Allow packages to add sed expressions

classes/binconfig.bbclass: Allow packages to add sed expressions

packages/apr/apr-util,apr use this, but it not been in the class

patch the config files to be 'installed' and not point to the build
and source-directory.

From OE-Classic:
http://git.openembedded.org/openembedded/commit/?id=030992bdd415c8892cf2925cf6fbe888226be046

[YOCTO #3267]

Orignal Author: Holger Freyther <zecke@selfish.org>
(From OE-Core rev: ab56f1063a666df5faddd97f44758c8ae378e51c)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>