curl and libcurl 7.81.0

 Public curl releases:         205
 Command line options:         244
 curl_easy_setopt() options:   295
 Public functions in libcurl:  86
 Contributors:                 2536

This release includes the following changes:

 o mime: use percent-escaping for multipart form field and file names [1]

This release includes the following bugfixes:

 o azure: make the "w/o HTTP/SMTP/IMAP" build disable SSL proper [12]
 o configure: add -lm to configure for rustls build. [13]
 o configure: better diagnostics if hyper is built wrong [6]
 o configure: don't enable TLS when --without-* flags are used [17]
 o curl_easy_cleanup.3: remove from multi handle first [3]
 o curl_share_setopt.3: split out options into their own manpages [14]
 o docs/checksrc: Add documentation for STRERROR [18]
 o multi: shut down CONNECT in Curl_detach_connnection [2]
 o runtests: make the SSH library a testable feature
 o rustls: read of zero bytes might be okay [9]
 o rustls: remove incorrect EOF check [10]
 o test302[12]: run only with the libssh2 backend [8]
 o url.c: fix the SIGPIPE comment for Curl_close [4]
 o vtls/rustls: adapt to the updated rustls_version proto [19]
 o zuul.d: update rustls-ffi to version 0.8.2 [5]

This release includes the following known bugs:

 o see docs/KNOWN_BUGS (https://curl.se/docs/knownbugs.html)

This release would not have looked like this without help, code, reports and
advice from friends like these:

  Dan Fandrich, Daniel Stenberg, Jacob Hoffman-Andrews, Kevin Burke,
  Patrick Monnerat, Paul Howarth, Rikard Falkeborn, Ryan Sleevi, Stan Hu,
  Stephen M. Coakley, Viktor Szakats, Vincent Grande,
  (12 contributors)

References to bug reports and discussions on issues:

 [1] = https://curl.se/bug/?i=7789
 [2] = https://curl.se/bug/?i=7982
 [3] = https://curl.se/bug/?i=7983
 [4] = https://curl.se/bug/?i=7984
 [5] = https://curl.se/bug/?i=8013
 [6] = https://curl.se/bug/?i=8001
 [8] = https://curl.se/bug/?i=8009
 [9] = https://curl.se/bug/?i=8003
 [10] = https://curl.se/bug/?i=8003
 [12] = https://curl.se/bug/?i=8006
 [13] = https://curl.se/bug/?i=8002
 [14] = https://curl.se/bug/?i=7998
 [17] = https://curl.se/bug/?i=7994
 [18] = https://curl.se/bug/?i=7991
 [19] = https://curl.se/bug/?i=7956