Added __lc_codepage_func wrapper to libmsvcrt.a and use __lc_codepage_func directly instead of __mingw_get_codepage extention.

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@5895 4407c894-4637-0410-b4f5-ada5f102cad1