Faster startup

Fastest startup I've gotten down to, on latest brand-new master:

```
$ julia -O1 --compile=min -q
julia> @time using PyCall
0.564175 seconds (189.99 k allocations: 12.739 MiB)
```
With the new options, I'm trying out in a PR elsewhere:
https://github.com/JuliaPackaging/BinaryBuilder.jl/pull/900/files

The thing is, I can't get this low, by starting with Julia with no options, and I'm puzzled as either the code change or the CLI options are slower, but together fastest... any idea what I'm doing wrong?

Start by reproducing the reported `julia -O1 --compile=min -q` and no-option startup comparisons, then inspect the linked BinaryBuilder.jl pull request. The issue names no project files or tests; done means explaining the startup discrepancy or identifying a specific, reproducible change to improve it.

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