Fix linking of libpmix when emitted #4046
                
     Merged
            
            
          
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When we specify --with-devel-headers, we also emit a copy of libpmix. However, that library was built against the OPAL libevent component, which means all the libevent functions are prefixed with OPAL names. So ensure that the emitted libpmix is linked back against libopen-pal so those symbols will be resolved.
Fixes #4045
Signed-off-by: Ralph Castain [email protected]
(cherry picked from commit d593e5a)