Wrap content of lib/sysacls.c in ifdef, like it's
done in rsync. Fixes build with USE=-acl
https://bugs.gentoo.org/971729
--- a/lib/sysacls.c
+++ b/lib/sysacls.c
@@ -24,6 +24,8 @@
 #include "rsync.h"
 #include "sysacls.h"
 
+#ifdef SUPPORT_ACLS
+
 #ifdef DEBUG
 #undef DEBUG
 #endif
@@ -2790,3 +2792,5 @@
 	}
 	return 0;
 }
+
+#endif /* SUPPORT_ACLS */