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.

mingw-w64-crt/Makefile.am

diff --git a/mingw-w64-crt/Makefile.am b/mingw-w64-crt/Makefile.am
index c2a9e95..5cb3c7d 100644
--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -896,7 +896,6 @@
   misc/__p__winver.c \
   misc/__timezone.c \
   misc/__tzname.c \
-  stdio/_telli64.c \
   stdio/_wfindfirst32.c \
   stdio/_wfindnext32.c \
   stdio/_wstat32.c \
@@ -915,6 +914,7 @@
   stdio/_fstat32i64.c \
   stdio/_lseeki64.c \
   stdio/_stat32i64.c \
+  stdio/_telli64.c \
   stdio/_wfindfirst32i64.c \
   stdio/_wfindnext32i64.c \
   stdio/_wstat32i64.c \