- remove h3 issues believed to be fixed

- make the flaky CI issue be generic and not Windows specific

- "TLS session cache does not work with TFO" now documented

  This is now a documented restriction and not a bug. TFO in general is
  rarely used and has other problems, making it a low-priotity thing to
  work on.

- remove "Renegotiate from server may cause hang for OpenSSL backend"

  This is an OpenSSL issue, not a curl one. Even if it taints curl.

- rm "make distclean loops forever"

- rm "configure finding libs in wrong directory"

  Added a section to docs/INSTALL.md about it.

- "A shared connection cache is not thread-safe"

  Moved over to TODO and expanded for other sharing improvements we
  could do

- rm "CURLOPT_OPENSOCKETPAIRFUNCTION is missing"

- rm "Blocking socket operations in non-blocking API"

  Already listed as a TODO

- rm "curl compiled on OSX 10.13 failed to run on OSX 10.10"

  Water under the bridge. No one cares about this anymore.

- rm "build on Linux links libcurl to libdl"

  Verified to not be true (anymore).

- rm "libpsl is not supported"

  The cmake build supports it since cafb356

Closes curl#10963