v5.2.6
Windows: Fix building of resource files when config.h isn't used.
Bump version and soname for 5.2.6.
Build: Prepare to support Automake's subdir-objects.
xzgrep man page: Document exit statuses.
xz: Make --keep accept symlinks, hardlinks, and setuid/setgid/sticky.
Build: Add support for translated man pages using po4a.