Merge bitcoin-core/secp256k1#987: Fix unused parameter warnings when …

…building without VERIFY

189f6bc Fix unused parameter warnings when building without VERIFY (Jonas Nick)

Pull request description:

  This commit makes `./configure --enable-coverage && make check` free of warnings.

ACKs for top commit:
  practicalswift:
    cr ACK 189f6bc
  elichai:
    utACK 189f6bc
  siv2r:
    Tested ACK 189f6bc

Tree-SHA512: 727fe0e40ff61f404780b32dfa4102a58bed9d922e61bd17ddaaf1243b0c06edd9697ff4763b5e92d033e7db3778193bee07d85cfa3b9c46d45e5fec3f568009

src/util.h

@@ -140,6 +140,8 @@ static SECP256K1_INLINE void *manual_alloc(void** prealloc_ptr, size_t alloc_siz
     VERIFY_CHECK((unsigned char*)*prealloc_ptr >= (unsigned char*)base);
     VERIFY_CHECK(((unsigned char*)*prealloc_ptr - (unsigned char*)base) % ALIGNMENT == 0);
     VERIFY_CHECK((unsigned char*)*prealloc_ptr - (unsigned char*)base + aligned_alloc_size <= max_size);
+    /* Avoid unused parameter warnings when building without VERIFY */
+    (void) base; (void) max_size;
     ret = *prealloc_ptr;
     *prealloc_ptr = (unsigned char*)*prealloc_ptr + aligned_alloc_size;
     return ret;