call C11's timespec_get()

gettimeofday() is an obsolescent POSIX function which may be removed in
a future version. POSIX recommends using clock_gettime() (also POSIX)
instead, but it isn't available on OS X or Windows (at least with MSVC
and older MinGW versions).

Whereas timespec_get() is part of ISO C11 and mruby uses some small
other C11 features too. It isn't universally available yet either, but
it might be in the future. And Visual C++ 2015 implements it! Since
mruby strives for ISO C and not POSIX compatibility, I think it's a
reasonable choice.

TIME_UTC is used instead of __STDC_VERSION__, because if TIME_UTC is
defined, then most likely timespec_get() is too. This isn't true in case
of  __STDC_VERSION__ (see MSVC).

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