Autotest: list of tests uses ";" as separator with no protection

[Akim Demaille]

Hi all,

Bison has tests with semicolons in their title.  Everything is
displayed properly, except ./testsuite -l.  Indeed, I can read
in testsuite:

232;types.at:108;yacc.c api.value.type={union foo};api.value.type;
233;types.at:108;yacc.c %union { float fval; int ival; };;api.value.type;
234;types.at:108;yacc.c api.value.type=union;api.value.type;

so indeed test 233 is not displayed properly:

$ ./tests/testsuite -l 232-234
GNU Bison 2.7.1191-f249e test suite test groups:

 NUM: FILE-NAME:LINE     TEST-GROUP-NAME
      KEYWORDS

 232: types.at:108       yacc.c api.value.type={union foo}
      api.value.type
 233: types.at:108       yacc.c %union { float fval
      int ival
 234: types.at:108       yacc.c api.value.type=union
      api.value.type

Cheers!