MDEV-7771 missing client plugins when mariadb-shared is not installed

Put client plugins into -common rpm, not -shared.
Because they're needed for
* all clients that link with shared libmysqlclient (-shared)
* our clients from -client rpm, they're statically linked (-client)
* the server that acts as a replication slave (-server)

cmake/cpack_rpm.cmake

@@ -21,11 +21,12 @@ SET(CPACK_COMPONENT_MANPAGESCLIENT_GROUP "client")
 SET(CPACK_COMPONENT_README_GROUP "server")
 SET(CPACK_COMPONENT_SHAREDLIBRARIES_GROUP "shared")
 SET(CPACK_COMPONENT_COMMON_GROUP "common")
+SET(CPACK_COMPONENT_CLIENTPLUGINS_GROUP "common")
 SET(CPACK_COMPONENT_COMPAT_GROUP "compat")
 SET(CPACK_COMPONENTS_ALL Server ManPagesServer IniFiles Server_Scripts
                          SupportFiles Development ManPagesDevelopment
                          ManPagesTest Readme ManPagesClient Test 
-                         Common Client SharedLibraries)
+                         Common Client SharedLibraries ClientPlugins)
 
 SET(CPACK_RPM_PACKAGE_NAME "MariaDB")
 SET(CPACK_PACKAGE_FILE_NAME "${CPACK_RPM_PACKAGE_NAME}-${VERSION}-${RPM}-${CMAKE_SYSTEM_PROCESSOR}")

plugin/auth_dialog/CMakeLists.txt

@@ -15,4 +15,4 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 
 MYSQL_ADD_PLUGIN(dialog dialog.c ${CMAKE_SOURCE_DIR}/libmysql/get_password.c
-  MODULE_ONLY COMPONENT SharedLibraries)
+  MODULE_ONLY COMPONENT ClientPlugins)

plugin/auth_examples/CMakeLists.txt

@@ -30,4 +30,4 @@ MYSQL_ADD_PLUGIN(qa_auth_client qa_auth_client.c
 MYSQL_ADD_PLUGIN(auth_0x0100 auth_0x0100.c MODULE_ONLY COMPONENT Test)
 
 MYSQL_ADD_PLUGIN(mysql_clear_password clear_password_client.c
-  MODULE_ONLY COMPONENT SharedLibraries)
+  MODULE_ONLY COMPONENT ClientPlugins)

plugin/win_auth_client/CMakeLists.txt

@@ -29,7 +29,7 @@ IF(WIN32)
 
   MYSQL_ADD_PLUGIN(authentication_windows_client ${PLUGIN_SOURCES} ${HEADERS}
     LINK_LIBRARIES Secur32
-    MODULE_ONLY COMPONENT SharedLibraries)
+    MODULE_ONLY COMPONENT ClientPlugins)
 
   #IF(MSVC)
   #   INSTALL_DEBUG_TARGET(auth_win_client DESTINATION ${INSTALL_LIBDIR}/debug)