test: make T0 harness results complete

test/wcc/810_dyn.c

@@ -13,7 +13,7 @@
  *     the loader requires the right .gnu.version_r entry to bind
  *     the default vDSO-aware impl.
  *
- * Skipped (passing trivially) on systems without /usr/lib/libc.so.6.
+ * Reports the harness skip status on systems without a supported libc.so.6.
  */
 #include <stdio.h>
 #include <stdlib.h>
@@ -108,7 +108,7 @@ main(void)
 	    && access("/lib/x86_64-linux-gnu/libc.so.6", 0) != 0
 	    && access("/lib64/libc.so.6", 0) != 0) {
 		puts("dyn: no libc.so.6 on this system — skipping");
-		return 0;
+		return 77;
 	}
 
 	const char *bin = getenv("BIN");