[tests] fix stderr template path normalization macros for unix (haxe only lowercases paths on windows)
[tests] fix stderr template path normalization macros for unix (haxe only lowercases paths on windows)

pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe