MDEV-24883 fixup: Add a dependency

In commit 783625d7 we forgot to
declare a dependency on the generated file mysqld_error.h.

tpool/CMakeLists.txt

@@ -29,4 +29,8 @@ ADD_LIBRARY(tpool STATIC
   ${EXTRA_SOURCES}
 )
 
+IF(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND LIBURING)
+  ADD_DEPENDENCIES(tpool GenError)
+ENDIF()
+
 INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/include)