tests2: cleanup

- remove -norunsrc switch
  Meaning and usage (-run -norun...???) look sort of screwed.  Also
  general usefulness is unclear, so it was actually to support exactly
  one (not even very interesting) test

This partially reverts e31579b076

tcc.c

@@ -69,7 +69,6 @@ static void help(void)
            "  -Bdir       use 'dir' as tcc internal library and include path\n"
            "  -MD         generate target dependencies for make\n"
            "  -MF depfile put generated dependencies here\n"
-           "  -norunsrc   Do not compile the file which is the first argument after -run.\n"
            );
 }