replace posix_memalign with aligned_alloc

We can do this now that C++17 is available.

Signed-off-by: Rosen Penev <[email protected]>

configure.ac

@@ -87,8 +87,6 @@ LIBS="$PTHREAD_LIBS $ZLIB_LIBS $LIBS"
 TORRENT_ARG_OPENSSL
 TORRENT_ARG_CYRUS_RC4
 
-AC_CHECK_FUNCS(posix_memalign)
-
 TORRENT_CHECK_MADVISE
 TORRENT_CHECK_CACHELINE
 TORRENT_CHECK_POPCOUNT

rak/allocators.h

@@ -76,10 +76,7 @@ class cacheline_allocator {
   pointer allocate(size_type num, const_void_pointer hint = 0) { return alloc_size(num*sizeof(T)); }
 
   static pointer alloc_size(size_type size) {
-    pointer ptr = NULL;
-    [[maybe_unused]] int result = posix_memalign((void**)&ptr, LT_SMP_CACHE_BYTES, size);
-
-    return ptr;
+    return static_cast<pointer>(std::aligned_alloc(LT_SMP_CACHE_BYTES, size));
   }
 
   void construct (pointer p, const T& value) { new((void*)p)T(value); }