Merge /u/gmbr3/gnu-efi/ branch TRUEFALSE into master

https://sourceforge.net/p/gnu-efi/code/merge-requests/49/

inc/efidef.h

@@ -34,9 +34,14 @@ typedef bool BOOLEAN;
    #define CONST const
 #endif
 #ifndef TRUE
+#if defined(__cplusplus) || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
+    #define TRUE    true
+    #define FALSE   false
+#else
     #define TRUE    ((BOOLEAN) 1)
     #define FALSE   ((BOOLEAN) 0)
 #endif
+#endif
 
 #ifndef NULL
 #if (defined(__cplusplus) && __cplusplus >= 201103L) || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)