libc-common: Allow -dbg package to append, and not just set package variables
The libc-common attempts to rewrite the package information in a way similar
to debian.bbclass. When it does this, it should be appending to the
dependency variables (RPROVIDES, RREPLACES, and RCONFLICTS), instead
of simply setting a hard coded value. Otherwise the lib package can not
tailor the dependency variables to suite it's needs.
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
