Add relibc syscall priority patch and clean up IOMMU recipe

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/patches/relibc/P3-syscall-0.7.4-procschemeattrs-ens-to-prio.patch

@@ -0,0 +1,13 @@
+diff --git a/redox-rt/src/proc.rs b/redox-rt/src/proc.rs
+index 05e42757..f2eba231 100644
+--- a/redox-rt/src/proc.rs
++++ b/redox-rt/src/proc.rs
+@@ -1119,7 +1119,7 @@ pub fn new_child_process(args: &ForkArgs<'_>) -> Result<NewChildProc> {
+                 pid: 0,
+                 euid: 0,
+                 egid: 0,
+-                ens: 1,
++                prio: 1,
+                 debug_name: {
+                     let mut buf = [0; 32];
+                     let src = b"[init]";

local/recipes/system/iommu/recipe.toml

@@ -9,6 +9,3 @@ template = "cargo"
 dependencies = [
     "redox-driver-sys",
 ]
-
-[package.files]
-"/usr/lib/drivers/iommu" = "iommu"