Use C23 bool.

Upstream bug: https://github.com/yasm/yasm/pull/287

--- yasm-1.3.0/libyasm/bitvect.h	2011-08-28 00:13:19.000000000 +0100
+++ yasm-1.3.0/libyasm/bitvect.h	2025-07-04 01:49:23.422436445 +0100
@@ -77,15 +77,7 @@
 #define TRUE        (0==0)
 #endif
 
-#ifdef __cplusplus
-    typedef bool boolean;
-#else
-    #ifdef MACOS_TRADITIONAL
-        #define boolean Boolean
-    #else
-        typedef enum boolean { false = FALSE, true = TRUE } boolean;
-    #endif
-#endif
+typedef bool boolean;
 
 /*****************************************************************************/
 /*  MODULE INTERFACE:                                                        */