kernel: Phase J [patch.crates-io] libredox (mirror of base's commit)

The kernel needs the same libredox override as base: the
local libredox fork at ../libredox uses the local syscall
fork at ../syscall, so the kernel's libredox::error::Error
type is now the same compile-time type as syscall::Error.
The [patch.crates-io] libredox override in the kernel
workspace is what wires this through.

This is the kernel-side mirror of the base commit
aadf55b ('base: Phase J [patch.crates-io] libredox +
kstop_enter_s2idle helper').

Cargo.toml

@@ -118,3 +118,16 @@ panic = "abort"
 panic = "abort"
 #lto = true
 debug = "full"
+
+# Red Bear OS Phase J: see local/sources/base/Cargo.toml for
+# the rationale. Both the kernel and the base workspace need
+# the libredox override so that the libredox::error::Error
+# type is the same compile-time type as syscall::Error. With
+# the local libredox fork at local/sources/libredox/ using
+# the local syscall fork at local/sources/syscall/, the
+# libredox::error::Error (re-exported from the local syscall)
+# and syscall::Error (also the local syscall) are now the
+# same type, so `?` conversions in scheme-utils / daemon
+# compile cleanly.
+[patch.crates-io]
+libredox = { path = "../libredox" }