feature/native-comp f2e6168: * Remove a warning for conventional build

[Andrea Corallo]

branch: feature/native-comp
commit f2e6168ece69d635b4f9d9a138100c6772903d0b
Author: Andrea Corallo <akrl@sdf.org>
Commit: Andrea Corallo <akrl@sdf.org>

    * Remove a warning for conventional build
    
        * src/lread.c (parent_directory): Add ATTRIBUTE_UNUSED.
---
 src/lread.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lread.c b/src/lread.c
index f5a7d44..f10a20d 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -1099,7 +1099,7 @@ close_infile_unwind (void *arg)
   infile = prev_infile;
 }
 
-static Lisp_Object
+static ATTRIBUTE_UNUSED Lisp_Object
 parent_directory (Lisp_Object directory)
 {
   return Ffile_name_directory (Fsubstring (directory,