secp256k1-sys 0.13.0

FFI for Pieter Wuille's `libsecp256k1` library.
Documentation 
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13,37d12
< static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t size) {
<     const size_t base_alloc = ROUND_TO_ALIGN(sizeof(secp256k1_scratch));
<     void *alloc = checked_malloc(error_callback, base_alloc + size);
<     secp256k1_scratch* ret = (secp256k1_scratch *)alloc;
<     if (ret != NULL) {
<         memset(ret, 0, sizeof(*ret));
<         memcpy(ret->magic, "scratch", 8);
<         ret->data = (void *) ((char *) alloc + base_alloc);
<         ret->max_size = size;
<     }
<     return ret;
< }
< 
< static void secp256k1_scratch_destroy(const secp256k1_callback* error_callback, secp256k1_scratch* scratch) {
<     if (scratch != NULL) {
<         if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
<             secp256k1_callback_call(error_callback, "invalid scratch space");
<             return;
<         }
<         VERIFY_CHECK(scratch->alloc_size == 0); /* all checkpoints should be applied */
<         memset(scratch->magic, 0, sizeof(scratch->magic));
<         free(scratch);
<     }
< }
<