api: Properly export lily_import_use_package_dir.
This was an oversight that was missed in the import rewrite done in
the last release. The function `lily_import_use_local_dir` was
exported twice. The docs don't need to be updated since the name was
correct in the documentation.
@@ -440,7 +440,7 @@ void lily_import_use_local_dir(lily_state *s, const char *dir);
// imports, then use `lily_import_use_local_dir(s, "test")`.
//
// This lasts until the other function is called.
-void lily_import_use_local_dir(lily_state *s, const char *dir);
+void lily_import_use_package_dir(lily_state *s, const char *dir);
// Function: lily_import_current_root_dir
// Return the directory of the package that the source import belongs to.
