cmake: remove libssh2 feature checks

libssh2 features are detected based on version since commit
9dbbba9976

Closes #7343

CMakeLists.txt

@@ -716,15 +716,6 @@ if(CMAKE_USE_LIBSSH2)
     set(HAVE_LIBSSH2_H ON)
     set(CURL_INCLUDES ${CURL_INCLUDES} "${LIBSSH2_INCLUDE_DIR}/libssh2.h")
     set(CURL_TEST_DEFINES "${CURL_TEST_DEFINES} -DHAVE_LIBSSH2_H")
-
-    # now check for specific libssh2 symbols as they were added in different versions
-    set(CMAKE_EXTRA_INCLUDE_FILES "libssh2.h")
-    check_function_exists(libssh2_version           HAVE_LIBSSH2_VERSION)
-    check_function_exists(libssh2_init              HAVE_LIBSSH2_INIT)
-    check_function_exists(libssh2_exit              HAVE_LIBSSH2_EXIT)
-    check_function_exists(libssh2_scp_send64        HAVE_LIBSSH2_SCP_SEND64)
-    check_function_exists(libssh2_session_handshake HAVE_LIBSSH2_SESSION_HANDSHAKE)
-    set(CMAKE_EXTRA_INCLUDE_FILES "")
     unset(CMAKE_REQUIRED_LIBRARIES)
   endif()
 endif()

lib/curl_config.h.cmake

@@ -356,21 +356,6 @@
 /* Define to 1 if you have the `ssh2' library (-lssh2). */
 #cmakedefine HAVE_LIBSSH2 1
 
-/* Define to 1 if libssh2 provides `libssh2_version'. */
-#cmakedefine HAVE_LIBSSH2_VERSION 1
-
-/* Define to 1 if libssh2 provides `libssh2_init'. */
-#cmakedefine HAVE_LIBSSH2_INIT 1
-
-/* Define to 1 if libssh2 provides `libssh2_exit'. */
-#cmakedefine HAVE_LIBSSH2_EXIT 1
-
-/* Define to 1 if libssh2 provides `libssh2_scp_send64'. */
-#cmakedefine HAVE_LIBSSH2_SCP_SEND64 1
-
-/* Define to 1 if libssh2 provides `libssh2_session_handshake'. */
-#cmakedefine HAVE_LIBSSH2_SESSION_HANDSHAKE 1
-
 /* Define to 1 if you have the <libssh2.h> header file. */
 #cmakedefine HAVE_LIBSSH2_H 1