Revert "Remove tests that depend on TLS or X.509"

This reverts commit 9afb2e9921.

Conflicts:
* include/CMakeLists.txt
  * "Make config.h available" comment: there has been a change
    adjacent to where it was removed. Just re-add what was removed.
* tests/CMakeLists.txt:
  * compat.sh: there has been a change immediately before where it was
    removed. Just re-add what was removed.

scripts/output_env.sh

@@ -15,6 +15,7 @@
 #   - type and version of the operating system
 #   - version of armcc, clang, gcc-arm and gcc compilers
 #   - version of libc, clang, asan and valgrind if installed
+#   - version of gnuTLS and OpenSSL
 
 print_version()
 {
@@ -73,6 +74,42 @@ echo
 print_version "valgrind" "--version" "valgrind not found!"
 echo
 
+: ${OPENSSL:=openssl}
+print_version "$OPENSSL" "version" "openssl not found!"
+echo
+
+if [ -n "${OPENSSL_LEGACY+set}" ]; then
+    print_version "$OPENSSL_LEGACY" "version" "openssl legacy version not found!"
+    echo
+fi
+
+if [ -n "${OPENSSL_NEXT+set}" ]; then
+    print_version "$OPENSSL_NEXT" "version" "openssl next version not found!"
+    echo
+fi
+
+: ${GNUTLS_CLI:=gnutls-cli}
+print_version "$GNUTLS_CLI" "--version" "gnuTLS client not found!" "head -n 1"
+echo
+
+: ${GNUTLS_SERV:=gnutls-serv}
+print_version "$GNUTLS_SERV" "--version" "gnuTLS server not found!" "head -n 1"
+echo
+
+if [ -n "${GNUTLS_LEGACY_CLI+set}" ]; then
+    print_version "$GNUTLS_LEGACY_CLI" "--version" \
+        "gnuTLS client legacy version not found!"  \
+        "head -n 1"
+    echo
+fi
+
+if [ -n "${GNUTLS_LEGACY_SERV+set}" ]; then
+    print_version "$GNUTLS_LEGACY_SERV" "--version" \
+        "gnuTLS server legacy version not found!"   \
+        "head -n 1"
+    echo
+fi
+
 if `hash dpkg > /dev/null 2>&1`; then
     echo "* asan:"
     dpkg -s libasan2 2> /dev/null | grep -i version