Add -DWITH_DEBUG=ON for build-binary.sh --debug

[Laurynas Biveinis]

Currently build-binary.sh --debug uses -DCMAKE_BUILD_CONFIG=Debug, which results in less debug code (safe mutexes) compiled in than with -DWITH_DEBUG=ON (see http://bugs.mysql.com/bug.php?id=70647).

We would like to have safe mutexes enabled for QA, thus add -DWITH_DEBUG=ON to build-binary.sh if --debug is specified. But that alone would not be a working fix because we also have -DWITH_INNODB_MEMCACHED=ON, and it unconditionally disables the safe mutexes. Thus figure out when do we want to have memcached libraries built by the script.

[Laurynas Biveinis (laurynas-biveinis)]

Upstream MySQL 8.0.3 might have a fix for this: https://bugs.mysql.com/bug.php?id=87068

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-2436