8251526: CTW fails to build after JDK-8251121

Reviewed-by: shade
diff --git a/test/hotspot/jtreg/testlibrary/ctw/Makefile b/test/hotspot/jtreg/testlibrary/ctw/Makefile
index 395db33..99d1c6f 100644
--- a/test/hotspot/jtreg/testlibrary/ctw/Makefile
+++ b/test/hotspot/jtreg/testlibrary/ctw/Makefile
@@ -45,6 +45,7 @@
 LIB_FILES = $(shell find $(TESTLIBRARY_DIR)/jdk/test/lib/ \
     $(TESTLIBRARY_DIR)/jdk/test/lib/process \
     $(TESTLIBRARY_DIR)/jdk/test/lib/util \
+    $(TESTLIBRARY_DIR)/jtreg \
     -maxdepth 1 -name '*.java')
 WB_SRC_FILES = $(shell find $(TESTLIBRARY_DIR)/sun/hotspot -name '*.java')
 EXPORTS=--add-exports java.base/jdk.internal.jimage=ALL-UNNAMED \