* src/secmem.c (pooldesc_s): Add fields next, cur_alloced, and
cur_blocks.
(cur_alloced, cur_blocks): Remove vars.
(ptr_into_pool_p): Make it inline.
(stats_update): Add arg pool and update the new pool specific
counters.
(_gcry_secmem_malloc_internal): Add arg xhint and allocate overflow
pools as needed.
(_gcry_secmem_malloc): Pass XHINTS along.
(_gcry_secmem_realloc_internal): Ditto.
(_gcry_secmem_realloc): Ditto.
(_gcry_secmem_free_internal): Take multiple pools in account.  Add
return value to indicate whether the arg was freed.
(_gcry_secmem_free): Add return value to indicate whether the arg was
freed.
(_gcry_private_is_secure): Take multiple pools in account.
(_gcry_secmem_term): Release all pools.
(_gcry_secmem_dump_stats): Print stats for all pools.
* src/stdmem.c (_gcry_private_free): Replace _gcry_private_is_secure
test with a direct call of _gcry_secmem_free to avoid double checking.