* dcrt0.cc (cygwin_atexit): Change preceeding comment to reflect

API version numbers.
	* external.cc (cygwin_internal): disable setting cxx_malloc on 64 bit.
	Add CW_FIXED_ATEXIT case.
	* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
	* include/sys/cygwin.h (cygwin_getinfo_types): Add CW_FIXED_ATEXIT.
	* lib/atexit.c (atexit): Test running Cygwin version by checking
	return value of cygwin_internal (CW_FIXED_ATEXIT).

winsup/cygwin/external.cc

@@ -243,11 +243,13 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	break;
 
       case CW_USER_DATA:
+#ifndef __x86_64__
 	/* This is a kludge to work around a version of _cygwin_common_crt0
 	   which overwrote the cxx_malloc field with the local DLL copy.
 	   Hilarity ensues if the DLL is not loaded like while the process
 	   is forking. */
 	__cygwin_user_data.cxx_malloc = &default_cygwin_cxx_malloc;
+#endif
 	res = (uintptr_t) &__cygwin_user_data;
 	break;
 
@@ -673,6 +675,10 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	}
 	break;
 
+      case CW_FIXED_ATEXIT:
+	res = 0;
+	break;
+
       default:
 	set_errno (ENOSYS);
     }