classes/binconfig: create binconfig package instead of doing binconfig-fixup

[hundeboll]

Packages that create a ${PN}-config script used by dependent packages
during their configure step, inherits the binconfig class to both fixup
paths in the script and to make the script available to dependent
packages during their stage step.

Until now, this was done by the binconfig class, which adds a call to
binconfig_stage_fixup() during the dependent stage step. However,
binconfig_stage_fixup() symlinks into ./stage/cross/bin/, which is
not "allowed" in the stage fixup functions. (They should only touch
./stage.unpack/ and not ./stage ).

Also, the symlink-during-stage fixup approach might fail as
./stage/cross/bin is not guarenteed to be created when
binconfig_stage_fixup() is called.

Fix this mess by changing the class to create the symlink during
do_install(), and adding the symlink to cross-package created in the
class (${PN}-binconfig). Provide this package to dependent packages
by adding cross:${PN}-binconfig as a dependency to the primary package.

[esben]

You are also dropping all the path rewrite hackery. Could you please add some comments on why this is a good thing?

[hundeboll]

My mistanke; i'll resubmit tomorrow...

[esben]

Maybe call it ${PN}-binconfig-cross to make it more clear that it is not actually the binconfig files, but just a cross thingy (ie. symlink) of it.