- Stick to a single unified way to use structs
 - Make checksrc complain on 'typedef struct {'
 - Allow them in tests, public headers and examples

 - Let MD4_CTX, MD5_CTX, and SHA256_CTX typedefs remain as they actually
   typedef different types/structs depending on build conditions.

Closes #5338

Fine: "struct hello *world"

Not fine: "struct hello* world" (and variations)

Closes #5386

The default target should only build libcurl and curl. Add a dedicated
'testdeps' target which will be used later when running tests. Note that
unittests are currently broken in CMake and already excluded.

Closes #5368

Text 1560 is extended to verify.

Reported-by: Pavel Volgarev
Fixes #5344
Closes #5351

OpenSSH for Windows shows group and other/world permissions as *,
because those concepts do not exist on Windows. It also does not
show the current or parent directory, so we just ignore those.

Reviewed-by: Daniel Stenberg
Closes #5328

A common set of functions instead of many separate implementations for
creating buffers that can grow when appending data to them. Existing
functionality has been ported over.

In my early basic testing, the total number of allocations seem at
roughly the same amount as before, possibly a few less.

See docs/DYNBUF.md for a description of the API.

Closes #5300

This has not been needed since commit 9fa42bed and often prevents it
from running at all with dynamic test ports.

These were commented out in e9dd0998706a when Makefile.inc was included
instead. 11 years have passed since then and the commented code is of
course very outdated. Remove it to avoid confusion.

Closes #5311

Closes #5169