expand the --with-mysql-source and --with-mysql-bindir paths so that '..' doesn't break things.
expand the --with-mysql-source and --with-mysql-bindir paths so that '..' doesn't break things.

DeNA/HandlerSocket-Plugin-for-MySQL,DeNA/HandlerSocket-Plugin-for-MySQL,DeNA/HandlerSocket-Plugin-for-MySQL,DeNA/HandlerSocket-Plugin-for-MySQL