Adjust commit 2dbe890 for ancient macOS.

macdice · macdice · commit 04cad8f7bcd6 · 2021-07-19T16:50:21.000+12:00
A couple of open flags used in an assertion didn't exist in macOS 10.4.
Per build farm animal prairiedog.  Also add O_EXCL while here (there are
a few more standard flags but they're not relevant and likely to be
missing).
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
@@ -1065,9 +1065,14 @@ BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode)
 	 */
 	StaticAssertStmt((PG_O_DIRECT &
 					  (O_APPEND |
+#if defined(O_CLOEXEC)
 					   O_CLOEXEC |
+#endif
 					   O_CREAT |
+#if defined(O_DSYNC)
 					   O_DSYNC |
+#endif
+					   O_EXCL |
 					   O_RDWR |
 					   O_RDONLY |
 					   O_SYNC |
