* translate placeholder code page numbers into actual code pages in
    fpc_ansistr_to_widechararray(), so that CP_ACP/CP_OEM etc are properly
    handled (fixes assign/assignfile with non-ansi characters in source files
    that don't explicitly specify the code page)

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@29218 3ad0048d-3df7-0310-abae-a5850022a9f2