don't hardcode stdlibs in precompile tests?

[StefanKarpinski]

The precompile tests have a list of stdlibs hardcoded in them here:

julia/test/precompile.jl

Lines 291 to 295 in 1378bb6

	[:Base64, :CRC32c, :Dates, :DelimitedFiles, :Distributed, :FileWatching, :Markdown,
	:Future, :Libdl, :LinearAlgebra, :Logging, :Mmap, :Printf,
	:Profile, :Random, :Serialization, :SharedArrays, :SparseArrays, :SuiteSparse, :Test,
	:Unicode, :REPL, :InteractiveUtils, :Pkg, :LibGit2, :SHA, :UUIDs, :Sockets,
	:Statistics, :TOML]),

I don't really understand why this is hardcoded here—would it be possible to not hardcode this? Otherwise this is a pretty obscure place that needs to be updated if you add or remove stdlibs.