reintroduce hardening against partially-replaced allocator
commit 618b18c7 removed the previous detection and hardening since it was incorrect. commit 72141795 already handled all that remained for hardening the static-linked case. in the dynamic-linked case, have the dynamic linker check whether malloc was replaced and make that information available. with these changes, the properties documented in commit c9f415d7 are restored: if calloc is not provided, it will behave as malloc+memset, and any of the memalign-family functions not provided will fail with ENOMEM.
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