open-vm-tools: always set rpath to OEM library directory

By default /usr/share/oem/lib64 is included in ld.so.conf but if for any
reason ld.so.cache is generated incorrectly vmtoolsd will fail. Using
rpath instead avoids depending on the state of ld.so.cache.
bootengine: do not run ldconfig in the initrd
Merge pull request #1024 from marineam/fixes

vmtoolsd library path fixes