[PATCH] reftable: make REFTABLE_UNUSED C99 compatible

["Carlo Marcelo Arenas Belón" <carenas@gmail.com>]

Since f93b2a0424 (reftable/basics: introduce `REFTABLE_UNUSED`
annotation, 2025-02-18), the reftable library was migrated to
use an internal version of `UNUSED`, which unconditionally sets
a GNU __attribute__ to avoid warnings function parameters that
are not being used.

Make the definition conditional to prevent breaking the build
with non GNU compilers.

Reported-by: "Randall S. Becker" <rsbecker@nexbridge.com>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
 reftable/basics.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/reftable/basics.h b/reftable/basics.h
index d8888c1262..7d22f96261 100644
--- a/reftable/basics.h
+++ b/reftable/basics.h
@@ -16,7 +16,11 @@
 #include "system.h"
 #include "reftable-basics.h"
 
+#ifdef __GNUC__
 #define REFTABLE_UNUSED __attribute__((__unused__))
+#else
+#define REFTABLE_UNUSED
+#endif
 
 /*
  * Initialize the buffer such that it is ready for use. This is equivalent to
-- 
2.50.0.rc0.1.gb4243b6ac8