Fixed exit when boolean is passed

Return abnomal status code when false is passed, per R7RS

CHANGELOG.md

@@ -12,6 +12,9 @@ Features
 Bug Fixes
 
 - Fixed the MSYS2 build script and instructions, so it is possible to build on Windows again!
+- Fixed `exit` to return the appropriate status code when a boolean is passed, per R7RS:
+
+> If no argument is supplied, or if obj is #t, the exit procedure should communicate to the operating system that the program exited normally. If obj is #f, the exit procedure should communicate to the operating system that the program exited abnormally.
 
 Deprecated
 

runtime.c

@@ -3193,6 +3193,10 @@ void Cyc_halt(object obj)
     exit(obj_obj2int(obj));
   }
 
+  if (obj == boolean_f) {
+    exit(1);
+  }
+
   exit(0);
 }