prog: Fix page fault for syz-stress users.

In resources.go, haveGettime is False when SyscallMap["clock_gettime"]
is nil.

In this code, there's a branch that's entered only if Gettime is False,
which appends SyscallMap["clock_gettime"] to resourceCtors.  That is, it
appends nil to resourceCtors, then iterates through resourceCtors and
tries to dereference the .Name of each time, in this case, nil.Name.

This was causing a page fault on Fuchsia.

I'm not certain how the "standard" flow is supposed to work, since it
seems like any code that enters the `if cantCreate == "" && !haveGettime`
should fail... but, removing that section causes test failures, so let's
just enforce that SyscallMap["clock_gettime"] is non-nil.

If there's a better way to solve this, I'm open to suggestions.

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