[OctDev] passing -R to mkoctfile

[<dan...@mc...>]

I'm wondering if the mkoctfile script should be extended to allow -Rpath or maybe
-Wl,-Rpath to be passed on to the compiler?  I was working on something which
links to a shared lib which may or may not be installed in a place where shared
libs are searched for.  Without mkoctfile accepting -Rpath I end up having to
set LD_LIBRARY_PATH.

Basically, the -[lL] line in mkoctfile could be changed to -[lLR].

Thoughts?

-Dan

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