[Prefix] Fix installation of packages in nightly

[giordano]

With Julia v1.9 we have to use Pkg.respect_sysimage_versions(false) to install
stdlib JLLs in our projects.

Opening as draft because tests are failing anyway for me even with this change, but I don't have the time to debug now.

[giordano]

Failure is

Setup: Test Failed at /home/runner/work/BinaryBuilderBase.jl/BinaryBuilderBase.jl/test/dependencies.jl:160
  Expression: readdir(joinpath(destdir(dir, platform), "logs")) == []
   Evaluated: ["LibCURL", "LibSSH2", "MbedTLS"] == Any[]
Stacktrace:
 [1] macro expansion
   @ /opt/hostedtoolcache/julia/nightly/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:464 [inlined]
 [2] (::var"#37#59")(dir::String)
   @ Main ~/work/BinaryBuilderBase.jl/BinaryBuilderBase.jl/test/dependencies.jl:160

It's the cleanup that is failing, very weird...

[giordano]

The new builds of LibCURL and other related stdlib JLLs used in Julia v1.9 have logs in subdirectories of ${prefix}/logs, rather than directly inside this directory. So, I believe the failure is related to the broken test

BinaryBuilderBase.jl/test/dependencies.jl

Lines 158 to 159 in f78a16a

	# This shuld be empty, but the `curl/` directory is left here, empty
	@test_broken readdir(joinpath(destdir(dir, platform), "include")) == []

which boils down to the fact we can remove only symlinked directories in cleanup_dependencies

BinaryBuilderBase.jl/src/Prefix.jl

Line 244 in f78a16a

# Unsymlink all symlinked directories, non-symlink directories will be culled in audit.

but non-symlinked directories have to be removed later.

[giordano]

The only thing I don't understand is this: this job was successful and it used

Julia Version 1.9.0-DEV.92
Commit 2e2c16a446 (2022-02-25 17:18 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: 2 × Intel(R) Xeon(R) Platinum 8171M CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-13.0.1 (ORCJIT, skylake-avx512)
  Threads: 1 on 2 virtual cores

which was already after JuliaLang/julia#43250 was merged, so now I'm not sure why that one worked at it's failing only now with

Julia Version 1.9.0-DEV.98
Commit 2338f5d304 (2022-02-28 01:32 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: 2 × Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-13.0.1 (ORCJIT, skylake-avx512)
  Threads: 1 on 2 virtual cores