mlang/tests: Some old IE versions truncate one character to short [try 2]

[Detlef Riekenberg]

This reverts
http://source.winehq.org/git/wine.git/?a=commitdiff;h=3a5a79ff759b758253ecec25d3359380cea64532
and fix the failures properly.
 
This time with an own lstrcpyW implementation to make
the test usable on win95


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By by ... Detlef