Stackframe paths to Stdlib files incorrect

[BioTurboNick]

Raising this comment on #33065 to a full issue because I just encountered it and realized it was leading to a weird bit of logic in my AbbreviatedStackTraces.jl package.

Base file paths all start with ./ or .\, but Stdlib paths all point to an absolute path that was present on the build machine. For consistency, if base is considered the working directory for stack traces, this could be ../stdlib/v1.8/.

In version 1.3.0 on Win_64 platform, I get this:

ERROR: MethodError: no method matching randstring(::Int64, ::String)
Closest candidates are:
  randstring(::AbstractRNG, ::Any) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.3\Random\src\misc.jl:74

It must be a hard-coded path since this machine does not even contain a D drive.
The actual path is AppData\Local\

Originally posted by @K-Kent in #33065 (comment)

[BioTurboNick]

I can try to address it myself, but would need input on the proper path to use instead.

[KristofferC]

Call Base.fixup_stdlib_path on the path before showing it.

[BioTurboNick]

Oh, thanks! I guess it was fixed in Base but I was overriding it.