gdb/testsuite: allow for Clang style destructors on gdb.cp/m-static.exp

when running gdb.cp/m-static.exp using Clang, we get the following
failures:

    print test1.~gnu_obj_1^M
    $6 = {void (gnu_obj_1 * const)} 0x555555555470 <gnu_obj_1::~gnu_obj_1()>^M
    (gdb) FAIL: gdb.cp/m-static.exp: simple object instance, print destructor
    ptype test1.~gnu_obj_1^M
    type = void (gnu_obj_1 * const)^M
    (gdb) FAIL: gdb.cp/m-static.exp: simple object instance, ptype destructor
    print test1.'~gnu_obj_1'^M
    $7 = {void (gnu_obj_1 * const)} 0x555555555470 <gnu_obj_1::~gnu_obj_1()>^M
    (gdb) FAIL: gdb.cp/m-static.exp: simple object instance, print quoted destructor

This is because the test is expecting an extra integer parameter on the
destructor. Looking at the debuginfo, it seems that there is nothing
actually wrong with this output, so these tests were changed to test
multiple possible regexps.

Approved-by: Tom Tromey <tom@tromey.com>