openssl: drop support for OpenSSL <1.1.1, LibreSSL <2.7 (2018-03-21)

- OpenSSL 1.0.2 is officially not supported for open source,
  OpenSSL 1.1.0 is officially not supported at all.
  https://openssl-library.org/policies/releasestrat/index.html

- LibreSSL 2.6.x and older are just old. 2.7.0 was released on 2018-03-21.

Closes #1668

.github/workflows/ci.yml

@@ -242,16 +242,6 @@ jobs:
             crypto: OpenSSL-111-from-source
             build: cmake
             zlib: 'ON'
-          - compiler: gcc
-            arch: amd64
-            crypto: OpenSSL-110-from-source
-            build: cmake
-            zlib: 'ON'
-          - compiler: gcc
-            arch: amd64
-            crypto: OpenSSL-102-from-source
-            build: cmake
-            zlib: 'ON'
           - compiler: gcc
             arch: amd64
             crypto: BoringSSL
@@ -298,8 +288,6 @@ jobs:
       LIBRESSL_VERSION: 4.1.0
       OPENSSL_VERSION: 3.5.2
       OPENSSL111_VERSION: 1.1.1w
-      OPENSSL110_VERSION: 1.1.0l
-      OPENSSL102_VERSION: 1.0.2u
     steps:
       - name: 'install architecture'
         if: ${{ matrix.arch != 'amd64' }}
@@ -465,40 +453,6 @@ jobs:
           make
           make -j1 install_sw
 
-      - name: 'cache OpenSSL 1.1.0'
-        if: ${{ matrix.crypto == 'OpenSSL-110-from-source' }}
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
-        id: cache-openssl110
-        with:
-          path: ~/usr
-          key: ${{ runner.os }}-openssl-${{ env.OPENSSL110_VERSION }}-${{ matrix.arch }}
-
-      - name: 'install OpenSSL 1.1.0 from source'
-        if: ${{ matrix.crypto == 'OpenSSL-110-from-source' && !steps.cache-openssl110.outputs.cache-hit }}
-        run: |
-          curl -fsS -L "https://github.com/openssl/openssl/releases/download/OpenSSL_1_1_0l/openssl-${OPENSSL110_VERSION}.tar.gz" | tar -xz
-          cd "openssl-${OPENSSL110_VERSION}"
-          ./config no-unit-test no-makedepend --prefix="$HOME"/usr
-          make
-          make -j1 install_sw
-
-      - name: 'cache OpenSSL 1.0.2'
-        if: ${{ matrix.crypto == 'OpenSSL-102-from-source' }}
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
-        id: cache-openssl102
-        with:
-          path: ~/usr
-          key: ${{ runner.os }}-openssl-${{ env.OPENSSL102_VERSION }}-${{ matrix.arch }}
-
-      - name: 'install OpenSSL 1.0.2 from source'
-        if: ${{ matrix.crypto == 'OpenSSL-102-from-source' && !steps.cache-openssl102.outputs.cache-hit }}
-        run: |
-          curl -fsS -L "https://github.com/openssl/openssl/releases/download/OpenSSL_1_0_2u/openssl-${OPENSSL102_VERSION}.tar.gz" | tar -xz
-          cd "openssl-${OPENSSL102_VERSION}"
-          ./config no-unit-test no-makedepend --prefix="$HOME"/usr -fPIC
-          make
-          make -j1 install_sw
-
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           persist-credentials: false