[gdb/testsuite] Use maint ignore-probes in gdb.base/solib-corrupted.exp

Test-case gdb.base/solib-corrupted.exp only works for a glibc without probes
interface, otherwise we run into:
...
XFAIL: gdb.base/solib-corrupted.exp: info probes
UNTESTED: gdb.base/solib-corrupted.exp: GDB is using probes
...

Fix this by using maint ignore-probes to simulate the absence of the relevant
probes.

Also, it requires glibc debuginfo, and if not present, it produces an XFAIL:
...
XFAIL: gdb.base/solib-corrupted.exp: make solibs looping
UNTESTED: gdb.base/solib-corrupted.exp: no _r_debug symbol has been found
...
This is incorrect, because an XFAIL indicates a known problem in the
environment.  In this case, there is no problem: the environment is
functioning as expected when glibc debuginfo is not installed.

Fix this by using UNSUPPORTED instead, and make the message less cryptic:
...
UNSUPPORTED: gdb.base/solib-corrupted.exp: make solibs looping \
  (glibc debuginfo required)
...

Finally, with glibc debuginfo present, we run into:
...
(gdb) PASS: gdb.base/solib-corrupted.exp: make solibs looping
info sharedlibrary^M
warning: Corrupted shared library list: 0x7ffff7ffe750 != 0x0^M
From                To                  Syms Read   Shared Object Library^M
0x00007ffff7dd4170  0x00007ffff7df4090  Yes         /lib64/ld-linux-x86-64.so.2^M
(gdb) FAIL: gdb.base/solib-corrupted.exp: corrupted list \
  (shared library list corrupted)
...
due to commit 44288716537 ("gdb, testsuite: extend gdb_test_multiple checks").

Fix this by rewriting into gdb_test_multiple and using -early.

Tested on x86_64-linux, with and without glibc debuginfo installed.

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