build: fix ECH to always enable HTTPS RR

The ECH feature cannot be built without HTTPS RR.

ECH automatically implied HTTPS RR in `./configure` but not in CMake,
winbuild, documentation.

Also update documentation and CI configs.

Follow-up to a362962b72 #11922
Closes #15648

.github/workflows/http3-linux.yml

@@ -283,7 +283,7 @@ jobs:
               --with-ngtcp2=$HOME/ngtcp2/build --enable-warnings --enable-werror --enable-debug
               --with-test-nghttpx="$HOME/nghttp2/build/bin/nghttpx"
               --with-wolfssl=$HOME/wolfssl/build
-              --enable-httpsrr --enable-ech
+              --enable-ech
 
           - name: wolfssl
             PKG_CONFIG_PATH: '$HOME/wolfssl/build/lib/pkgconfig:$HOME/nghttp3/build/lib/pkgconfig:$HOME/ngtcp2/build/lib/pkgconfig:$HOME/nghttp2/build/lib/pkgconfig'
@@ -291,7 +291,7 @@ jobs:
               -DCURL_USE_WOLFSSL=ON -DUSE_NGTCP2=ON -DENABLE_DEBUG=ON
               -DTEST_NGHTTPX="$HOME/nghttp2/build/bin/nghttpx"
               -DHTTPD_NGHTTPX="$HOME/nghttp2/build/bin/nghttpx"
-              -DUSE_HTTPSRR=ON -DUSE_ECH=ON
+              -DUSE_ECH=ON
 
           - name: openssl-quic
             PKG_CONFIG_PATH: '$HOME/openssl/build/lib64/pkgconfig'