fix cmake dependencies

perfschema after 5.6 merge depends on sql_yacc.h

Author: vuvova

storage/perfschema/CMakeLists.txt

@@ -182,6 +182,9 @@ table_session_account_connect_attrs.cc
 )
 
 MYSQL_ADD_PLUGIN(perfschema ${PERFSCHEMA_SOURCES} STORAGE_ENGINE DEFAULT STATIC_ONLY)
-IF(WITH_PERFSCHEMA_STORAGE_ENGINE AND WITH_UNIT_TESTS)
-  ADD_SUBDIRECTORY(unittest)
-ENDIF()
+IF (TARGET perfschema)
+  ADD_DEPENDENCIES(perfschema GenServerSource)
+  IF(WITH_UNIT_TESTS)
+    ADD_SUBDIRECTORY(unittest)
+  ENDIF(WITH_UNIT_TESTS)
+ENDIF(TARGET perfschema)