Add the LD_LIBRARY_PATH_FDS environmental variable.

This variable allows the loading of shared libraries via directory descriptors
rather than via library paths.  If LD_LIBRARY_PATH_FDS=3:4:12, the directories
represented by file descriptors 3, 4 and 12 will searched for shared libraries
before the normal path-based mechanisms are used.  This allows us to execute
unprivileged binaries from within a Capsicum sandbox even if they require
shared libraries.

Approved by:	rwatson (mentor)
Reviewed by:	kib
MFC after:	3 weeks
Sponsored by:	DARPA/AFRL

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