cmake: fix incorrect hint for OPENSSL_ROOT_DIR

If you use a ; separated set of include and lib directories,
it'll detect the headers in /usr/include and the libraries
where this points to.

CMakeLists.txt

@@ -898,9 +898,9 @@ elseif(Boost_FOUND)
     set(BOOST_BEFORE_1_62 true)
   endif()
   if (BOOST_BEFORE_1_62)
-      message(FATAL_ERROR "Boost older than 1.62 is too old to link with OpenSSL 1.1 or newer. "
+      message(FATAL_ERROR "Boost ${Boost_VERSION} (older than 1.62) is too old to link with OpenSSL ${OPENSSL_VERSION} (1.1 or newer) found at ${OPENSSL_INCLUDE_DIR} and ${OPENSSL_LIBRARIES}. "
                           "Update Boost or install OpenSSL 1.0 and set path to it when running cmake: "
-                          "cmake -DOPENSSL_ROOT_DIR='/usr/include/openssl-1.0;/usr/lib/openssl-1.0'")
+                          "cmake -DOPENSSL_ROOT_DIR='/usr/include/openssl-1.0'")
   endif()
 endif()