[6.28] Backport of #14276 #14278
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[6.28] Backport of #14276 #14278
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The variables present in TError.h are used throughout the ROOT libraries. Anytime one of these variables is requested, e.g. with a simple test such as `python -c "import ROOT; ROOT.kError"`, the interpreter will lookup the corresponding symbol. Previously, the variables were declared and defined in the header directly but were not generating any symbol since the linkage was internal. With this commit, provide external linkage to these variables so that the corresponding symbols are materialized in libCore.so. As a consequence, a huge number of extra lookups by cling is avoided.
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Backport of #14276