AIX: Add dg-options to tests that override operator new

[Graham Reed]

Unlike [many] ELF-based systems, AIX ld/bind does not export symbols 
from the main program by default.  Consequently, attempts to replace 
operator new() and friends, per 18.4.1, will fail.  It isn't sufficient 
to engage the runtime linker (-Wl,-brtl); the symbols must also be 
exported from the defining module.

Exporting could be done with an export list.  I am not, however, fluent 
enough in DejaGnu in general and the GCC use of it in particular to do 
that--in particular, how to specify the right relative path.  I did 
figure out how to use the -Wl,-bexpfull option, which will export all 
symbols from the main program.  (The -Wl,-bexpall option will not export 
symbols starting with underscore.)

The attached patch changes three testcases which require this symbol 
replacement behaviour, so that the -Wl,-bexpful,-brtl option sequence is 
added on AIX (all architectures).

As a result, the existing testcases ext/mt_allocator/check_new.cc, 
ext/pool_allocator/check_new.cc and 27_io/ios_base/storage/11584.cc will 
now pass execution test on AIX.

   * testsuite/ext/mt_allocator/check_new.cc: Add dg-options 
-Wl,-bexpfull,-brtl on *-*-aix*
   * testsuite/ext/pool_allocator/check_new.cc: Likewise
   * testsuite/27_io/ios_base/storage/11584.cc: Likewise

I have run these 3 testcases on powerpc-ibm-aix5.3.0.0, verifying 4 
multilib combinations: '', 'ppc64', 'pthread', and 'pthread/ppc64' in 
the 4.5.2 release code.  (The 3 files are unchanged in the trunk as of 
r169055.)

I propose this change for the trunk only.
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