[tz] [PATCH 4/5] Allow builder to override GRANDPARENTED

[Paul Eggert via tz]

* private.h (GRANDPARENTED): Define only if not already defined.
---
 private.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/private.h b/private.h
index e5f6af59..074da284 100644
--- a/private.h
+++ b/private.h
@@ -99,7 +99,9 @@
 #endif
 
 /* This string was in the Factory zone through version 2016f.  */
-#define GRANDPARENTED  "Local time zone must be set--see zic manual page"
+#ifndef GRANDPARENTED
+# define GRANDPARENTED "Local time zone must be set--see zic manual page"
+#endif
 
 /*
 ** Defaults for preprocessor symbols.
-- 
2.51.0