fuzzing: set LC_ALL=C when running GNU printf

fuzz/fuzz_targets/fuzz_printf.rs

@@ -10,6 +10,7 @@ use uu_printf::uumain;
 
 use rand::seq::SliceRandom;
 use rand::Rng;
+use std::env;
 use std::ffi::OsString;
 
 mod fuzz_common;
@@ -82,6 +83,8 @@ fuzz_target!(|_data: &[u8]| {
     args.extend(printf_input.split_whitespace().map(OsString::from));
     let rust_result = generate_and_run_uumain(&args, uumain, None);
 
+    // TODO remove once uutils printf supports localization
+    env::set_var("LC_ALL", "C");
     let gnu_result = match run_gnu_cmd(CMD_PATH, &args[1..], false, None) {
         Ok(result) => result,
         Err(error_result) => {