[PATCH] Fix memory leaks in libstdc++ ABI tests

[David Edelsohn]

The memory leak cleanup has introduced a testsuite failure on AIX:

/nasfarm/edelsohn/src/src/libstdc++-v3/testsuite/abi/pr42230.cc: In
function 'int main()':
/nasfarm/edelsohn/src/src/libstdc++-v3/testsuite/abi/pr42230.cc:15:
error: 'free' is not a member of 'std'
compiler exited with status 1