Fix bug 1238008 (srv_cleaner_flush_chunk_size different default for
regular and UNIV_PERF_DEBUG binaries; wrong default for regular ones).

The fix is to correct the variable definition init value.
Automerge lp:~laurynas-biveinis/percona-server/bug1238008
Fix bug 1239418 (Installing Percona Server 5.6 GA release shows RC
instead GA on Debian-based systems) by removing the "rc" substring
from server_suffix in build/debian/rules.
Automerge lp:~laurynas-biveinis/percona-server/bug1239418