kernel: [patch.crates-io] libredox + [patch.'<URL>'] redox_syscall for Phase J

Phase J: the kernel needs two Cargo patch overrides so
that the typed-AcPiVerb path (EnterS2Idle / ExitS2Idle)
is usable. Without these:
* the kernel's redox_syscall dep is fetched from
  gitlab.redox-os.org (upstream), so the local fork at
  local/sources/syscall (with the new AcPiVerb variants)
  is not visible to the kernel's build.
* the libredox dep is fetched from crates.io, so the
  local fork at local/sources/libredox (which uses the
  local syscall fork) is not visible. This means
  libredox::error::Error and syscall::Error are
  different compile-time types and the E0277 errors in
  scheme-utils and daemon return.

The fix: a single [patch.crates-io] section overriding
libredox (which is from crates.io) and a [patch.'<URL>']
section overriding redox_syscall (which is from a git URL).
[patch.crates-io] only matches crates.io deps; [patch.'<URL>']
matches the dep's source URL.

Also: declare members = ['.', 'rmm'] in the [workspace]
section. Without this, cargo doesn't recognize the kernel
as a workspace and the [patch] sections are silently
ignored (workspace_metadata is None). The members list
includes the kernel's own directory and the rmm path
dep.

Cargo.toml

@@ -1,5 +1,6 @@
 [workspace]
 resolver = "3"
+members = [".", "rmm"]
 
 [package]
 name = "kernel"
@@ -130,4 +131,18 @@ debug = "full"
 # same type, so `?` conversions in scheme-utils / daemon
 # compile cleanly.
 [patch.crates-io]
+# Phase J: override libredox 0.1.17 to use the local
+# fork at ../libredox/ (which itself uses the local syscall
+# fork). This breaks the libredox::error::Error <->
+# syscall::Error type-identity barrier that previously
+# caused E0277 errors in scheme-utils and daemon.
 libredox = { path = "../libredox" }
+# Phase J: the kernel's redox_syscall dep is a git URL
+# (not crates.io), so [patch.crates-io] doesn't apply.
+# Use a [patch."<URL>"] section to match the dep source.
+# The local fork at ../syscall adds the EnterS2Idle /
+# ExitS2Idle AcpiVerb variants — the kernel's direct use
+# of AcpiVerb in src/scheme/acpi.rs's kcall handler
+# needs the fork to see these variants.
+[patch."https://gitlab.redox-os.org/redox-os/syscall.git"]
+redox_syscall = { path = "../syscall" }