fix(launcher.rs): hide file output behind appropriate feature flag

discovered while debugging AFLplusplus#2111

libafl/src/events/launcher.rs

@@ -98,6 +98,7 @@ where
     /// The list of cores to run on
     cores: &'a Cores,
     /// A file name to write all client output to
+    #[cfg(all(unix, feature = "std", feature = "fork"))]
     #[builder(default = None)]
     stdout_file: Option<&'a str>,
     /// The actual, opened, `stdout_file` - so that we keep it open until the end
@@ -106,6 +107,7 @@ where
     opened_stdout_file: Option<File>,
     /// A file name to write all client stderr output to. If not specified, output is sent to
     /// `stdout_file`.
+    #[cfg(all(unix, feature = "std", feature = "fork"))]
     #[builder(default = None)]
     stderr_file: Option<&'a str>,
     /// The actual, opened, `stdout_file` - so that we keep it open until the end

libafl_qemu/libafl_qemu_build/src/build.rs

@@ -4,9 +4,8 @@ use std::{
     process::Command,
 };
 
-use which::which;
 use crate::cargo_add_rpath;
-
+use which::which;
 
 const QEMU_URL: &str = "git@git.tu-berlin.de:niklas.jacob/asp-qemu.git";
 const QEMU_DIRNAME: &str = "qemu-libafl-bridge";
@@ -158,7 +157,7 @@ fn configure_qemu(
         .arg("--disable-mpath")
         .arg("--disable-multiprocess")
         .arg("--disable-netmap")
-//        .arg("--disable-nettle")
+        //        .arg("--disable-nettle")
         .arg("--disable-numa")
         .arg("--disable-nvmm")
         .arg("--disable-opengl")