Update cling's patches to be relative to its LastKnownGood.
Simplify some of the patches by reverting some of the changed llvm / clang files to the original ones.


git-svn-id: https://root.cern.ch/svn/root/trunk@49363 27541ba8-7e3a-0410-8455-c3a389f83636
Fix patch paths.


git-svn-id: https://root.cern.ch/svn/root/trunk@49364 27541ba8-7e3a-0410-8455-c3a389f83636
Improve patch paths.


git-svn-id: https://root.cern.ch/svn/root/trunk@49365 27541ba8-7e3a-0410-8455-c3a389f83636