find associated build file in case of missing build config data

The associated build file resolution mechanism may fail to find the
build file because the necessary build config from running
the build.zig may not have finished yet.

These changes should ensure that the associated build file is kept
unresolved until all necessary information is available.

src/ComptimeInterpreter.zig

@@ -892,7 +892,7 @@ pub fn interpret(
                     } };
                 }
 
-                const import_uri = (try interpreter.document_store.uriFromImportStr(interpreter.allocator, interpreter.getHandle().*, import_str[1 .. import_str.len - 1])) orelse return error.ImportFailure;
+                const import_uri = (try interpreter.document_store.uriFromImportStr(interpreter.allocator, interpreter.getHandle(), import_str[1 .. import_str.len - 1])) orelse return error.ImportFailure;
                 defer interpreter.allocator.free(import_uri);
 
                 const import_handle = interpreter.document_store.getOrLoadHandle(import_uri) orelse return error.ImportFailure;