Fix chunk_alloc_mmap() bugs.

Simplify chunk_alloc_mmap() to no longer attempt map extension.  The
extra complexity isn't warranted, because although in the success case
it saves one system call as compared to immediately falling back to
chunk_alloc_mmap_slow(), it also makes the failure case even more
expensive.  This simplification removes two bugs:

- For Windows platforms, pages_unmap() wasn't being called for unaligned
  mappings prior to falling back to chunk_alloc_mmap_slow().  This
  caused permanent virtual memory leaks.
- For non-Windows platforms, alignment greater than chunksize caused
  pages_map() to be called with size 0 when attempting map extension.
  This always resulted in an mmap() error, and subsequent fallback to
  chunk_alloc_mmap_slow().

src/chunk.c

@@ -134,6 +134,7 @@ chunk_alloc(size_t size, size_t alignment, bool base, bool *zero)
 
 	assert(size != 0);
 	assert((size & chunksize_mask) == 0);
+	assert(alignment != 0);
 	assert((alignment & chunksize_mask) == 0);
 
 	ret = chunk_recycle(size, alignment, base, zero);