Add toolchain specific RPATH in host_injections #1132

Job	Run time
eessi_container_script (listrepos_custom)	39s
eessi_container_script (container)	1m 27s
eessi_container_script (run)	1m 35s
eessi_container_script (shell)	1m 36s
eessi_container_script (help)	40s
eessi_container_script (unionfs)	1m 45s
eessi_container_script (listrepos_default)	38s
eessi_container_script (resume)	1m 39s
eessi_container_script (exec)	6h 5m 1s
eessi_container_script (no_cvmfs_mounts)	1m 39s
	6h 16m 39s

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