Rename the ALIGN macro to LINT_ALIGN so it does not clash with machine/param.h

Bump the alignment to 16bytes because lint1 memory allocator is used for
objects that require 16bytes alignment on amd64 (ie. val_t). This makes
lint1 work when compiled with compiler(s) that use SSE for memcpy on amd64.
(e.g. clang).

Approved by: ed (mentor)