Declare perf-literal feature and make it default

Cargo.toml

@@ -13,6 +13,10 @@ readme = "README.md"
 repository = "https://github.com/phiresky/ripgrep-all"
 version = "0.10.6"
 
+[features]
+default = ["perf-literal"]
+perf-literal = ["regex/perf-literal"]
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]