Print PRIVATE_SRC_LIST_FILE & PRIVATE_SRCJAR_LIST_FILE

to make sure if the inputs contains specific file path when
doclava throws the missing file error.

Test: m out/target/common/docs/core-current-stubs-gen-timestamp
Bug: b/76397326
Change-Id: Ib319912ae85e80fd53e7520f2c89268bb4b91c43
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index b174f31..fcc7d03 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -222,7 +222,7 @@
                 $(PRIVATE_DROIDDOC_OPTIONS) \
                 $(addprefix -stubs ,$(PRIVATE_STUB_OUT_DIR)) \
         && touch -f $@ \
-    ) || (rm -rf $(PRIVATE_OUT_DIR) $(PRIVATE_SRC_LIST_FILE); exit 45)
+    ) || (cat $(PRIVATE_SRC_LIST_FILE) $(PRIVATE_SRCJAR_LIST_FILE) && rm -rf $(PRIVATE_OUT_DIR) $(PRIVATE_SRC_LIST_FILE); exit 45)