fix(base): add P0-daemon-schemedaemon-option-unwrap.patch

The base build was failing with:

  error[E0277]: expected a `FnOnce(i32)` closure
    --> daemon/src/lib.rs:67:61
  error[E0308]: mismatched types
    --> daemon/src/lib.rs:119:63
    arguments to this function are incorrect

because P0-daemon-fix-init-notify-unwrap.patch changed `unsafe fn
get_fd(var: &str)` to return `Option<RawFd>` instead of `RawFd`,
but the upstream daemon code in SchemeDaemon::new still treated the
return value as `RawFd` (not `Option<RawFd>`).

This patch updates the SchemeDaemon code to handle the Option<RawFd>:
- Change `write_pipe` field to `Option<PipeWriter>`
- Use `.map(io::PipeWriter::from_raw_fd)` in new()
- Handle None case in ready_with_fd (return Ok early)

This matches the Daemon struct above and the Red Bear base fork at
local/sources/base.

local/patches/base/P0-daemon-schemedaemon-option-unwrap.patch

@@ -0,0 +1,33 @@
+diff --git a/daemon/src/lib.rs b/daemon/src/lib.rs
+index 9f507221..38752abc 100644
+--- a/daemon/src/lib.rs
++++ b/daemon/src/lib.rs
+@@ -83,21 +83,25 @@ impl Daemon {
+ /// A long running background process that handles requests using schemes.
+ #[must_use = "SchemeDaemon::ready must be called"]
+ pub struct SchemeDaemon {
+-    write_pipe: PipeWriter,
++    write_pipe: Option<PipeWriter>,
+ }
+ 
+ impl SchemeDaemon {
+     /// Create a new daemon for use with schemes.
+     pub fn new(f: impl FnOnce(SchemeDaemon) -> !) -> ! {
+-        let write_pipe = unsafe { io::PipeWriter::from_raw_fd(get_fd("INIT_NOTIFY")) };
++        let write_pipe = unsafe { get_fd("INIT_NOTIFY").map(io::PipeWriter::from_raw_fd) };
+ 
+         f(SchemeDaemon { write_pipe })
+     }
+ 
+     /// Notify the process that the scheme daemon is ready to accept requests.
+     pub fn ready_with_fd(self, cap_fd: Fd) -> syscall::Result<()> {
++        let write_pipe = match self.write_pipe {
++            Some(pipe) => pipe,
++            None => return Ok(()),
++        };
+         syscall::call_wo(
+-            self.write_pipe.as_raw_fd() as usize,
++            write_pipe.as_raw_fd() as usize,
+             &cap_fd.into_raw().to_ne_bytes(),
+             syscall::CallFlags::FD,
+             &[],

recipes/core/base/recipe.toml

@@ -2,7 +2,7 @@
 git = "https://gitlab.redox-os.org/redox-os/base.git"
 rev = "463f76b9608a896e6f6c9f63457f57f6409873c7"
 patches = [
-    "P0-daemon-fix-init-notify-unwrap.patch",
+    "P0-daemon-schemedaemon-option-unwrap.patch",
     "P0-redox-scheme-bump-0.11.1.patch",
     "P0-workspace-add-bootstrap.patch",
     "P0-init-continuous-scheduling.patch",