v3.1.x: README: Add note about --with-foo and RPATH #5770
                
     Merged
            
            
          
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Specifically mention our intended behavior about /usr and /usr/lib
(and why we don't add /usr/lib[64] and /usr/local/lib[64] to RPATH).
Signed-off-by: Jeff Squyres [email protected]
(cherry picked from commit 9367440)