(uninitalized variables are detected by DBUG builds)
- Fixed wrong declaration which cased compile failure on 32 bit

cmake/build_configurations/mysql_release.cmake:
  Added -Wno-uninitialized to avoid warnings in release builds
  (uninitalized variables are detected by DBUG builds)
include/maria.h:
  Fixed wrong declaration which cased compile failure on 32 bit
include/myisam.h:
  Fixed wrong declaration which cased compile failure on 32 bit