crt: Provide emulation of _telli64 function for msvcrt20.dll

Commit 13c45d08ab27c5ee122da6ebf8f587d5670b8c69 enabled _telli64 emulation
for crtdll.dll and msvcrt10.dll, but incorrectly stated that _telli64 is
available since msvcrt20.dll. But it is not available in msvcrt20.dll, it
is available since msvcrt40.dll.