* rltty.c (block_sigint, release_sigint): Rename to...
(_rl_block_sigint, _rl_release_sigint): ...these and make them global.
* rltty.h (_rl_block_sigint, _rl_release_sigint): New prototypes.
* display.c (rl_redisplay): Wrap the function by the calls to
_RL_BLOCK_SIGINT and _RL_RELEASE_SIGINT.