winetest: Explain why the source filename is printed.

It is used by analysis tools like test.winehq.org to link to the
relevant test source file.

Signed-off-by: Francois Gouget <fgouget@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
diff --git a/programs/winetest/main.c b/programs/winetest/main.c
index 3b2342a..4d1fa28 100644
--- a/programs/winetest/main.c
+++ b/programs/winetest/main.c
@@ -773,6 +773,7 @@
 static void
 run_test (struct wine_test* test, const char* subtest, HANDLE out_file, const char *tempdir)
 {
+    /* Build the source filename so analysis tools can link to it */
     const char* file = get_test_source_file(test->name, subtest);
 
     if (test_filtered_out( test->name, subtest ))