MDEV-7161: Build failure in buildbot on work-amd64-valgrind

Fix for embedded build failure.
Also added wsrep_info plugin library to server debian package.

debian/dist/Debian/mariadb-server-10.1.files.in

@@ -12,6 +12,7 @@ usr/lib/mysql/plugin/semisync_master.so
 usr/lib/mysql/plugin/semisync_slave.so
 usr/lib/mysql/plugin/sql_errlog.so
 usr/lib/mysql/plugin/server_audit.so
+usr/lib/mysql/plugin/wsrep_status.so
 usr/lib/libhsclient.so.*
 etc/mysql/debian-start
 etc/mysql/conf.d/mysqld_safe_syslog.cnf

debian/dist/Ubuntu/mariadb-server-10.1.files.in

@@ -12,6 +12,7 @@ usr/lib/mysql/plugin/semisync_master.so
 usr/lib/mysql/plugin/semisync_slave.so
 usr/lib/mysql/plugin/sql_errlog.so
 usr/lib/mysql/plugin/server_audit.so
+usr/lib/mysql/plugin/wsrep_status.so
 usr/lib/libhsclient.so.*
 etc/apparmor.d/usr.sbin.mysqld
 usr/share/apport/package-hooks/source_mariadb-10.1.py

plugin/wsrep_info/CMakeLists.txt

 IF (WITH_WSREP)
   INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/sql
                       ${CMAKE_SOURCE_DIR}/wsrep)
-  MYSQL_ADD_PLUGIN(WSREP_STATUS plugin.cc)
+  MYSQL_ADD_PLUGIN(WSREP_STATUS plugin.cc MODULE_ONLY)
 ENDIF()