Should set rpath to $ORIGIN for libs with non-exist rpath #671
Description
Given a wheel with following libs.
When handling b.so, auditwheel will only set its rpath when b.so has a valid rpath:
auditwheel/src/auditwheel/lddtree.py
Line 248 in 5ef7bd5
auditwheel/src/auditwheel/repair.py
Lines 186 to 187 in 5ef7bd5
When rpath of b.so is not empty, we should also replace it with $ORIGIN no matter if it's valid.
a.so -> b.so -> c.so
a.so -> c.so
a.so: rpath=$ORIGIN
b.so: runpath=<nonexist>
Currently this failed because b.so could not fine c.so.