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fix pkg loading from read-only filesystems on unix (#61253)

On our HPC systems `/home` is mounted read-only on the compute nodes,
and if you load a precompiled pkg you'll see errors like the following:

```
julia> using DataFrames
ERROR: SystemError: futimes: Permission denied
Stacktrace:
  [1] systemerror(p::Symbol, errno::Int32; extrainfo::Nothing)
    @ Base ./error.jl:186
  [2] systemerror
    @ ./error.jl:185 [inlined]
  [3] touch
    @ ./filesystem.jl:361 [inlined]
  [4] touch(path::String)
    @ Base.Filesystem ./file.jl:546
  [5] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt128, stalecheck::Bool; reasons::Dict{String, Int64}, DEPOT_PATH::Vector{String})
    @ Base ./loading.jl:2090
...
```

But touching read-only files is supposed to be fine, according to the
code comments:


https://github.com/JuliaLang/julia/blob/<a class=hub.com/JuliaLang/julia/commit/74d12302d74928dbe8c8883bdd395cd3e35481b9">74d12302d/base/loading.jl#L2058-L2064

However, only `IOError`s are ignored. On unix `touch()` calls `futimes`
in the C stdlib and throws `SystemError`:


https://github.com/JuliaLang/julia/blob/74d12302d74928dbe8c8883bdd395cd3e35481b9/base/filesystem.jl#L359-L368

This patch ignores all exceptions thrown when touching precompilation
files.

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