Fix const warning in dev_manager_info() and _dev_manager_lv_rmnodes().
Fix const warning in archive_file structure from archive.c.
Clean generated files .exported_symbols_generated, example.conf for distclean.
- Handle failure of all mirrored log devices and all but one mirror leg.
+ Handle failure of all mirrored log devices and all but one mirror leg.
Disallow 'mirrored' log type for cluster mirrors.
Do not use VPATH in include/Makefile.
Fix exported_symbols generation to use standard compiler arguments.