Merge pull request #836 from pwrdwnsys/openbsd-aligned_alloc

Add OpenBSD to posix_memalign ifdef

c++/src/kj/table.c++

@@ -288,8 +288,8 @@ void BTreeImpl::growTree(uint minCapacity) {
   // aligned_alloc() function. Unfortunately, many platforms don't implement it. Luckily, there
   // are usually alternatives.
 
-#if __APPLE__ || __BIONIC__
-  // OSX and Android lack aligned_alloc(), but have posix_memalign(). Fine.
+#if __APPLE__ || __BIONIC__ || __OpenBSD__
+  // macOS, OpenBSD, and Android lack aligned_alloc(), but have posix_memalign(). Fine.
   void* allocPtr;
   int error = posix_memalign(&allocPtr,
       sizeof(BTreeImpl::NodeUnion), newCapacity * sizeof(BTreeImpl::NodeUnion));