crt: test: Skip t_utime.c test on msvcrt10-msvcrt40

Currently the t_utime.c test for msvcrt10.dll, msvcrt20.dll and
msvcrt40.dll builds is failing because mingw-w64 emulation of _futime64()
and _fstat64() functions is not compatible with native 32-bit time variant
of those functions. Skip the test for now.