Drop the hand-rolled bool enum: `bool`, `true`, and `false` are reserved
keywords in C23 (the default since GCC 15), so the typedef no longer compiles.

--- a/src/rtl_fm_streamer.c
+++ b/src/rtl_fm_streamer.c
@@ -100,11 +100,7 @@

 #define DEFAULT_PORT_NUMBER "2346"

-typedef enum
-{
-    false = 0,
-    true
-}bool;
+#include <stdbool.h>

 struct dongle_state
 {