Fix string literals for DB2 on i#3740

fredericDelaporte wants to merge 3 commits intonhibernate:5.5.xnhibernate/nhibernate-core:5.5.xfrom

fredericDelaporte:GH3738-5.5.xfredericDelaporte/nhibernate-core:GH3738-5.5.xCopy head branch name to clipboard