malloca, xmalloca: Make multithread-safe. Reported by Florian Weimer <fweimer@redhat.com>. Implements an idea by Ondřej Bílka <neleai@seznam.cz>. * lib/malloca.h (malloca): In the stack allocation case, return a pointer that is a multiple of 2 * sa_alignment_max. (sa_increment): Remove enum item. * lib/xmalloca.h (xmalloca): In the stack allocation case, return a pointer that is a multiple of 2 * sa_alignment_max. * lib/malloca.c (NO_SANITIZE_MEMORY): Remove macro. (MAGIC_NUMBER, MAGIC_SIZE, preliminary_header, HEADER_SIZE, header, HASH_TABLE_SIZE, mmalloca_results): Remove. (small_t): New type. (mmalloca, free): Rewritten. * lib/malloca.valgrind: Remove file. * modules/malloca (Files): Remove it. (Depends-on): Remove verify.

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