MDEV-439 cmake -DWITHOUT_SERVER does not work

fix mysys/waiting_threads.c to compile w/o performance schema
include clients. scripts and manpages in -DWITHOUT_SERVER

CMakeLists.txt

@@ -298,14 +298,16 @@ ADD_SUBDIRECTORY(vio)
 ADD_SUBDIRECTORY(regex)
 ADD_SUBDIRECTORY(mysys)
 ADD_SUBDIRECTORY(libmysql)
-
+ADD_SUBDIRECTORY(client)
 ADD_SUBDIRECTORY(extra)
+ADD_SUBDIRECTORY(libservices)
+ADD_SUBDIRECTORY(scripts)
+ADD_SUBDIRECTORY(sql/share)
+ADD_SUBDIRECTORY(support-files)
+
 IF(NOT WITHOUT_SERVER)
   ADD_SUBDIRECTORY(tests)
-  ADD_SUBDIRECTORY(client)
   ADD_SUBDIRECTORY(sql)
-  ADD_SUBDIRECTORY(sql/share)
-  ADD_SUBDIRECTORY(libservices)
   OPTION (WITH_EMBEDDED_SERVER "Compile MySQL with embedded server" OFF)
   IF(WITH_EMBEDDED_SERVER) 
    ADD_SUBDIRECTORY(libmysqld)
@@ -314,12 +316,11 @@ IF(NOT WITHOUT_SERVER)
 
   ADD_SUBDIRECTORY(mysql-test)
   ADD_SUBDIRECTORY(mysql-test/lib/My/SafeProcess)
-  ADD_SUBDIRECTORY(support-files)
-  ADD_SUBDIRECTORY(scripts)
   ADD_SUBDIRECTORY(sql-bench)
-  IF(UNIX)
-    ADD_SUBDIRECTORY(man)
-  ENDIF()
+ENDIF()
+
+IF(UNIX)
+  ADD_SUBDIRECTORY(man)
 ENDIF()
 
 INCLUDE(cmake/abi_check.cmake)

mysys/waiting_threads.c

@@ -193,7 +193,9 @@ uint32 wt_success_stats;
 
 static my_atomic_rwlock_t cycle_stats_lock, wait_stats_lock, success_stats_lock;
 
+#ifdef HAVE_PSI_INTERFACE
 extern PSI_cond_key key_WT_RESOURCE_cond;
+#endif
 
 #ifdef SAFE_STATISTICS
 #define incr(VAR, LOCK)                           \