Import revision 49218 from the v5-34-00 patch branch:
From Bertrand:

 dladdr (and Dl_info) is not available on cygwin either.


git-svn-id: https://root.cern.ch/svn/root/trunk@49219 27541ba8-7e3a-0410-8455-c3a389f83636
fix typo


git-svn-id: https://root.cern.ch/svn/root/trunk@49220 27541ba8-7e3a-0410-8455-c3a389f83636
fix a memory leak in the assignment operator
see https://sft.its.cern.ch/jira/browse/ROOT-5045


git-svn-id: https://root.cern.ch/svn/root/trunk@49221 27541ba8-7e3a-0410-8455-c3a389f83636