MDEV-11790 WITHOUT_SERVER installs mysqld_safe_helper

Don't install server files if WITHOUT_SERVER is specified.
"Server files" are defined as files going into the MariaDB-Server RPM,
that is files in the components Server, ManPagesServer, Server_Scripts,
IniFiles, SuportFiles, and Readme.

cmake/mysql_add_executable.cmake

@@ -59,6 +59,9 @@ FUNCTION (MYSQL_ADD_EXECUTABLE)
     ELSE()
       SET(COMP COMPONENT Client)
     ENDIF()
+    IF (COMP MATCHES ${SKIP_COMPONENTS})
+      RETURN()
+    ENDIF()
     MYSQL_INSTALL_TARGETS(${target} DESTINATION ${ARG_DESTINATION} ${COMP})
   ENDIF()
 ENDFUNCTION()