re #13388 rb4382 fmd_api.h uses bool which is a C99/C++ keyword

@@ -545,11 +545,11 @@
         }
 
         switch (s.fmds_type) {
         case FMD_TYPE_BOOL:
                 mdb_printf("%-11p %-4s %-32s %s\n", addr, "bool",
-                    s.fmds_name, s.fmds_value.bool ? "true" : "false");
+                    s.fmds_name, s.fmds_value.b ? "true" : "false");
                 break;
         case FMD_TYPE_INT32:
                 mdb_printf("%-11p %-4s %-32s %d\n", addr, "i32",
                     s.fmds_name, s.fmds_value.i32);
                 break;