GCC doesn't like this:

filetree.c:744:9: error: variable-sized object may not be initialized

Since there's nothing changing at runtime at all, just make the compiler
see it's always going to be 1.

--- a/lib/filetree.c
+++ b/lib/filetree.c
@@ -740,7 +740,7 @@
 	size_t fspath1_size = 0, fspath2_size = 0;
 	size_t ns1_size = 0, ns2_size = 0;
 	const struct __xar_file_t * child1 = NULL, * child2 = NULL;
-	const uint keys_to_ignore_count = 1;
+#define keys_to_ignore_count 1
 	char * keys_to_ignore[keys_to_ignore_count] = { "id" }; // ID is allowed ot mismatch
 	
 	// If the two pointers match, call it the same.