Fix linking problem for #1612
When a library is examined, an object file within it can be left out of the link if it does not provide symbols that the symbol table needs. Introducing `isc_stdtime_tostring` caused a build failure for `update_test` because it now requires `libisc.a(stdtime.o)` and that also exports the `isc_stdtime_get` symbol, meaning we have a multiple definition error. Add a local version of `isc_stdtime_tostring`, so that the linker will not search for it in available object files.
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