vssh: drop support for wolfSSH

The implementation was incomplete and lesser than the other backends. No
one ever reported a bug or requested enhancements for this, indicating
that this backend was never used.

Closes #18700

.github/workflows/linux.yml

@@ -41,8 +41,6 @@ env:
   LIBRESSL_VERSION: 4.1.0
   # renovate: datasource=github-tags depName=wolfSSL/wolfssl versioning=semver extractVersion=^v?(?<version>.+)-stable$ registryUrl=https://github.com
   WOLFSSL_VERSION: 5.8.2
-  # renovate: datasource=github-tags depName=wolfSSL/wolfssh versioning=semver extractVersion=^v?(?<version>.+)-stable$ registryUrl=https://github.com
-  WOLFSSH_VERSION: 1.4.19
   # renovate: datasource=github-tags depName=Mbed-TLS/mbedtls versioning=semver registryUrl=https://github.com
   MBEDTLS_VERSION: 3.6.4
   # renovate: datasource=github-tags depName=awslabs/aws-lc versioning=semver registryUrl=https://github.com
@@ -94,8 +92,8 @@ jobs:
 
           - name: 'wolfssl-opensslextra valgrind'
             install_packages: valgrind
-            install_steps: wolfssl-opensslextra wolfssh
-            configure: LDFLAGS=-Wl,-rpath,/home/runner/wolfssl-opensslextra/lib --with-wolfssl=/home/runner/wolfssl-opensslextra --with-wolfssh=/home/runner/wolfssh --enable-ech --enable-debug
+            install_steps: wolfssl-opensslextra
+            configure: LDFLAGS=-Wl,-rpath,/home/runner/wolfssl-opensslextra/lib --with-wolfssl=/home/runner/wolfssl-opensslextra --enable-ech --enable-debug
 
           - name: 'mbedtls valgrind'
             install_packages: libnghttp2-dev libidn2-dev libldap-dev valgrind
@@ -186,7 +184,7 @@ jobs:
               --disable-dict --disable-gopher --disable-ldap --disable-telnet
               --disable-imap --disable-pop3 --disable-smtp
               --without-librtmp --disable-rtsp
-              --without-libssh2 --without-libssh --without-wolfssh
+              --without-libssh2 --without-libssh
               --disable-tftp --disable-ftp --disable-file --disable-smb
 
           - name: 'openssl torture !FTP'
@@ -405,31 +403,10 @@ jobs:
             --location "https://github.com/wolfSSL/wolfssl/archive/v${WOLFSSL_VERSION}-stable.tar.gz" | tar -xz
           cd "wolfssl-${WOLFSSL_VERSION}-stable"
           ./autogen.sh
-          ./configure --disable-dependency-tracking --enable-tls13 --enable-harden --enable-wolfssh --enable-ech --enable-opensslextra \
+          ./configure --disable-dependency-tracking --enable-tls13 --enable-harden --enable-ech --enable-opensslextra \
             --disable-benchmark --disable-crypttests --disable-examples --prefix=/home/runner/wolfssl-opensslextra
           make install
 
-      - name: 'cache wolfssh'
-        if: ${{ contains(matrix.build.install_steps, 'wolfssh') }}
-        uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4
-        id: cache-wolfssh
-        env:
-          cache-name: cache-wolfssh
-        with:
-          path: ~/wolfssh
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ env.WOLFSSH_VERSION }}-${{ env.WOLFSSL_VERSION }}
-
-      - name: 'build wolfssh'
-        if: ${{ contains(matrix.build.install_steps, 'wolfssh') && steps.cache-wolfssh.outputs.cache-hit != 'true' }}
-        run: |
-          curl --disable --fail --silent --show-error --connect-timeout 15 --max-time 120 --retry 6 --retry-connrefused \
-            --location "https://github.com/wolfSSL/wolfssh/archive/v${WOLFSSH_VERSION}-stable.tar.gz" | tar -xz
-          cd "wolfssh-${WOLFSSH_VERSION}-stable"
-          ./autogen.sh
-          ./configure --disable-dependency-tracking --with-wolfssl=/home/runner/wolfssl-opensslextra --enable-scp --enable-sftp --disable-term \
-            --disable-examples --prefix=/home/runner/wolfssh
-          make install
-
       - name: 'cache mbedtls'
         if: ${{ contains(matrix.build.install_steps, 'mbedtls') }}
         uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4
@@ -691,9 +668,6 @@ jobs:
           TFLAGS: '${{ matrix.build.tflags }}'
         run: |
           if [ "${TEST_TARGET}" = 'test-ci' ]; then
-            if [[ "${MATRIX_INSTALL_STEPS}" = *'wolfssh'* ]]; then
-              TFLAGS+=' ~SFTP'  # curl: (79) wolfssh SFTP connect error -1051 / WS_MATCH_KEY_ALGO_E / cannot match key algo with peer
-            fi
             if [[ "${MATRIX_INSTALL_PACKAGES}" = *'valgrind'* ]]; then
               TFLAGS+=' -j6'
               if [[ "${MATRIX_INSTALL_PACKAGES}" = *'heimdal-dev'* ]]; then