tests belong to check target

- the CustomTarget seems to be a test, not a build target
- worse, it is .PHONY
- ... and eats 30% of the top-level build-nocheck time alone
- so hopefully, we can we at least make it a check target

Change-Id: I113777cbd849aab9e8d0a77184e31194bc07232e
Reviewed-on: https://gerrit.libreoffice.org/8111Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>

unoidl/Module_unoidl.mk

@@ -16,9 +16,11 @@ $(eval $(call gb_Module_add_targets,unoidl, \
 ))
 
 $(eval $(call gb_Module_add_targets_for_build,unoidl, \
-    CustomTarget_unoidl-write_test \
     Executable_unoidl-check \
     Executable_unoidl-write \
 ))
 
+$(eval $(call gb_Module_add_check_targets,unoidl, \
+    CustomTarget_unoidl-write_test \
+))
 # vim: set noet sw=4 ts=4: