curl and libcurl 7.75.0

 Public curl releases:         197
 Command line options:         237
 curl_easy_setopt() options:   285
 Public functions in libcurl:  85
 Contributors:                 2302

This release includes the following changes:

 o curl: add --create-file-mode [mode] [28]
 o curl: add new variables to --write-out [25]
 o gopher: implement secure gopher protocol [2]
 o http: add Hyper as new optional HTTP backend [24]
 o http: introduce AWS HTTP v4 Signature support [26]

This release includes the following bugfixes:

 o badsymbols.pl: add verbose mode -v [31]
 o badsymbols.pl: ignore stand-alone single hash lines [40]
 o BUG-BOUNTY: minor language updates [5]
 o cmake: enable gophers correctly in curl-config [10]
 o cmdline-opts/gen.pl: return hard on errors [11]
 o connect: defer port selection until connect() time [22]
 o connect: on linux, enable reporting of all ICMP errors on UDP sockets [27]
 o connect: zero variable on stack to silence valgrind complaint [23]
 o cookie: avoid the C1001 internal compiler error with MSVC 14 [36]
 o curl: fix handling of -q option [39]
 o curl_easy_pause.3: add multiplexed pause effects [41]
 o CURLOPT_URL.3: remove scheme specific details [12]
 o digest_sspi: Show InitializeSecurityContext errors in verbose mode [8]
 o docs/URL-SYNTAX: the URL syntax curl accepts and works with [15]
 o docs: enable syntax highlighting in several docs files [16]
 o examples/libtest: add .checksrc to dist [14]
 o examples: remove superfluous asterisk uses
 o failf: remove newline from formatting strings [35]
 o getinfo: build with disabled HTTP support
 o h2: do not wait for RECV on paused transfers [43]
 o http: show the request as headers even when split-sending [7]
 o INSTALL: update the list known OSes and CPU archs curl has run on [38]
 o lib1564/5: verify that curl_multi_wakeup returns OK
 o misc: fix "warning: empty expression statement has no effect" [30]
 o mqtt: deal with 0 byte reads correctly [4]
 o mqtt: handle POST/PUBLISH without a set POSTFIELDSIZE [1]
 o multi: when erroring in TOOFAST state, act as for PERFORM [9]
 o ngtcp2: make it build it current master again [21]
 o OS400: update ccsidcurl.c [20]
 o quiche: remove fprintf() leftover
 o Revert "CI/github: work-around for brew breakage on macOS" [17]
 o runtests: add 'wakeup' as a feature
 o runtests: add support for %if [feature] conditions [19]
 o speedcheck: exclude paused transfers [42]
 o test1522: add debug tracing [3]
 o tests/mqttd: extract the client id from the correct offset [13]
 o tests: make --libcurl tests only test FTP options if ftp enabled [18]
 o tooĺ_writeout: fix the -w time output units [6]
 o travis: restrict the openssl3 job to only run https and ftps tests [34]

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:

  0xflotus on github, Cherish98 on github, Cory Benfield, Cristian Rodríguez,
  Dan Fandrich, Daniel Stenberg, Dennis Clarke, Douglas R. Reno,
  Earnestly on github, Gisle Vanem, Hans-Christian Noren Egtvedt,
  Harry Sintonen, Ian Spence, Jeremy Thibault, Jon Rumsey, Jon Wilkes,
  Matthias Gatto, Nick Zitzmann, parazyd on github, Ray Satiro, Sean McArthur,
  Tomas Berger, XhmikosR on github, 不确定
  (24 contributors)

        Thanks! (and sorry if I forgot to mention someone)

References to bug reports and discussions on issues:

 [1] = https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28735
 [2] = https://curl.se/bug/?i=6208
 [3] = https://curl.se/bug/?i=6331
 [4] = https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28676
 [5] = https://curl.se/bug/?i=6318
 [6] = https://curl.se/bug/?i=6321
 [7] = https://curl.se/bug/?i=6328
 [8] = https://curl.se/bug/?i=6315
 [9] = https://curl.se/bug/?i=6333
 [10] = https://curl.se/bug/?i=6336
 [11] = https://curl.se/bug/?i=6354
 [12] = https://curl.se/bug/?i=6307
 [13] = https://curl.se/bug/?i=6334
 [14] = https://curl.se/bug/?i=6176
 [15] = https://curl.se/bug/?i=6285
 [16] = https://curl.se/bug/?i=6286
 [17] = https://curl.se/bug/?i=6332
 [18] = https://curl.se/bug/?i=6303
 [19] = https://curl.se/bug/?i=6304
 [20] = https://curl.se/bug/?i=6292
 [21] = https://curl.se/bug/?i=6296
 [22] = https://curl.se/bug/?i=6295
 [23] = https://curl.se/bug/?i=6289
 [24] = https://curl.se/bug/?i=6110
 [25] = https://curl.se/bug/?i=6199
 [26] = https://curl.se/bug/?i=5703
 [27] = https://curl.se/bug/?i=6341
 [28] = https://curl.se/bug/?i=6244
 [30] = https://github.com/curl/curl/commit/08e8455dddc5e48e58a12ade3815c01ae3da3b64#commitcomment-45433279
 [31] = https://curl.se/bug/?i=6349
 [34] = https://curl.se/bug/?i=6345
 [35] = https://curl.se/bug/?i=6365
 [36] = https://curl.se/bug/?i=6112
 [38] = https://curl.se/bug/?i=6366
 [39] = https://curl.se/bug/?i=6364
 [40] = https://curl.se/mail/lib-2020-12/0084.html
 [41] = https://curl.se/bug/?i=6360
 [42] = https://curl.se/bug/?i=6358
 [43] = https://curl.se/bug/?i=6356