Adopt C99 bool in the midend API.

This changes parameters of midend_size and midend_print_puzzle, the
return types of midend_process_key, midend_wants_statusbar,
midend_can_format_as_text_now and midend_can_{undo,redo}, the 'bval'
field in struct config_item, and finally the return type of the
function pointer passed to midend_deserialise and identify_game.

The last of those changes requires a corresponding fix in clients of
midend_deserialise and identify_game, so in this commit I've also
updated all the in-tree front ends to match. I expect downstream front
ends will need to do the same when they merge this change.

1 files changed, 1 insertions, 1 deletions

diff --git a/emcc.c b/emcc.c
index 1d16d20..3a289f6 100644
--- a/emcc.c
+++ b/emcc.c
@@ -829,7 +829,7 @@ struct savefile_read_ctx {
     int len_remaining;
 };
 
-static int savefile_read(void *vctx, void *buf, int len)
+static bool savefile_read(void *vctx, void *buf, int len)
 {
     struct savefile_read_ctx *ctx = (struct savefile_read_ctx *)vctx;
     if (ctx->len_remaining < len)