clang does not like nested funcs.  use a define instead.

https://bugs.gentoo.org/451986

--- a/libelf/elf_begin.c
+++ b/libelf/elf_begin.c
@@ -1011,18 +1011,17 @@ elf_begin (fildes, cmd, ref)
       return NULL;
     }
 
-  Elf *lock_dup_elf ()
-  {
-    /* We need wrlock to dup an archive.  */
-    if (ref->kind == ELF_K_AR)
-      {
-	rwlock_unlock (ref->lock);
-	rwlock_wrlock (ref->lock);
-      }
-
-    /* Duplicate the descriptor.  */
-    return dup_elf (fildes, cmd, ref);
-  }
+#define lock_dup_elf() \
+  ({ \
+    /* We need wrlock to dup an archive.  */ \
+    if (ref->kind == ELF_K_AR) \
+      { \
+	rwlock_unlock (ref->lock); \
+	rwlock_wrlock (ref->lock); \
+      } \
+    /* Duplicate the descriptor.  */ \
+    dup_elf (fildes, cmd, ref); \
+  })
 
   switch (cmd)
     {