Update README.windows.md

added supporting information in cases when packages are failing to build in Windows
Windows: Don't test ispath on deleted file or dir

These are failing with "stat: operation not permitted (EPERM)". There may still be
file handles open so the unlinked file and removed directory cannot be stat-ed.
linrange for constructing ranges by endpoints and length
linrange length check, add tests
linrange type consistency
Clean up examples/. Add test/examples.jl to track breakage for examples. Fixes #7332.
Added mark/unmark/reset/ismarked to IOStream, IOBuffer, and AsyncStream
Also added show() for IOBuffer.

* Define mark, reset, unmark, ismarked for IO only.
  This is slightly sketchy, as it assumes that IO.mark exists, but
  is perhaps better than duplicating the code for all subtypes.
Fix rare and unlikely early free

During bootsrap, some code called the generic "map"
triggering compilation of the inference code in
jl_apply_generic -> jl_mt_assoc_by_type ->
cache_method. This particular map method gets
overwritten in the process and by the time
jl_apply_generic gets its function pointer back, it
is not present in the method table anymore.
Then, in jl_trampoline, compilation allocates some
managed memory, sometimes triggering GC, thus
sometimes freeing the function object before it is
called.
fix missing root on module allocation
Remove UNDOCUMENTED.rst from docs
Partially address #7385

This does not fully work on Windows, but is no worse than the current situation
Fix showing Dicts when show(value) is empty
improve fix for #5574 to move gotoblas_init back into DllInit
Add lyap() and sylvester().
Fix type stability of some operators on Complex32
remove vestigal AppData usage (as mentioned in #4358)
don't concatenate to etc/julia/juliarc.jl in make dist

This is already concatenated into as a prerequisite of `make release`,
and copied over by `make install` on line 235. There are 2 copies of
the `let user_data_dir` block in the distribution folder.
fix #4240
move windows utf8 support to the windows code branch
Test for lyap() and sylvester()
and taking some tests out of the inner loop in linalg1.jl