elf: Update DSO list, write audit log to elf/tst-audit23.out

elf: Update DSO list, write audit log to elf/tst-audit23.out

After commit 1d5024f4f052c12e404d42d3b5bfe9c3e9fd27c4
("support: Build with exceptions and asynchronous unwind tables
[BZ #30587]"), libgcc_s is expected to show up in the DSO
list on 32-bit Arm.  Do not update max_objs because vdso is not
tracked (and which is the reason why the test currently passes
even with libgcc_s present).

Also write the log output from the auditor to standard output,
for easier test debugging.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>