Update combine-tests.py for new vec syntax

Author: brson

src/etc/combine-tests.py

@@ -30,6 +30,8 @@ def scrub(b):
                 "xfail-fast" in s or
                 "xfail-win32" in s):
             stage2_tests.append(t)
+            if "main(args: [str]/~)" in s:
+                take_args[t] = True
             if "main(args: [str])" in s:
                 take_args[t] = True
         f.close()