Fixed some additional compiler warnings from OpenSolaris build.


extra/libevent/devpoll.c:
  Fixed compiler warning
mysys/my_file.c:
  Fixed compiler warning
sql/mysqld.cc:
  Fixed compiler warning
sql/rpl_record.cc:
  Removed not used variable
storage/maria/ma_blockrec.c:
  Fixed compiler warning
storage/xtradb/buf/buf0buf.c:
  Fixed compiler warning
storage/xtradb/handler/i_s.cc:
  Fixed compiler warning
support-files/compiler_warnings.supp:
  Added suppression of compiler warnings in InnoDB/XtraDB
  Added suppression of compiler warnings that can safely be ignored.