harfbuzz: Move ancillary binaries to ${PN}-bin

harfbuzz: Move ancillary binaries to ${PN}-bin

The binaries:

-rwxr-xr-x root/root     21956 2014-01-09 19:39 ./bin/hb-shape
-rwxr-xr-x root/root     21504 2014-01-09 19:39 ./bin/hb-ot-shape-closure
-rwxr-xr-x root/root     36520 2014-01-09 19:39 ./bin/hb-view

are not generally useful on target systems.  Also, their presence in the
same binary package as libharfbuzz.so defeats the debian package autonamer.
Inherit lib_package to move these to ${PN}-bin.

Signed-off-by: Phil Blundell <pb@pbcl.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>