microsoft/surface: add patch to handle newer rust versions

Author: 8bitbuddhist

microsoft/surface/common/kernel/6.12/patches.nix

@@ -151,4 +151,8 @@
     name = "ms-surface/0014-rtc";
     patch = patchSrc + "/0014-rtc.patch";
   }
+  {
+    name = "rust-1.91-fix";
+    patch = ../rust_1-91_fix.patch;
+  }
 ]

microsoft/surface/common/kernel/6.15/patches.nix

@@ -156,4 +156,8 @@
     name = "ms-surface/0015-rtc";
     patch = patchSrc + "/0015-rtc.patch";
   }
+  {
+    name = "rust-1.91-fix";
+    patch = ../rust_1-91_fix.patch;
+  }
 ]

microsoft/surface/common/kernel/rust_1-91_fix.patch

@@ -0,0 +1,30 @@
+diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs
+index 39c82908ff3a3f..38b3416bb9799e 100644
+--- a/scripts/generate_rust_target.rs
++++ b/scripts/generate_rust_target.rs
+@@ -225,7 +225,11 @@ fn main() {
+         ts.push("features", features);
+         ts.push("llvm-target", "x86_64-linux-gnu");
+         ts.push("supported-sanitizers", ["kcfi", "kernel-address"]);
+-        ts.push("target-pointer-width", "64");
++        if cfg.rustc_version_atleast(1, 91, 0) {
++            ts.push("target-pointer-width", 64);
++        } else {
++            ts.push("target-pointer-width", "64");
++        }
+     } else if cfg.has("X86_32") {
+         // This only works on UML, as i386 otherwise needs regparm support in rustc
+         if !cfg.has("UML") {
+@@ -245,7 +249,11 @@ fn main() {
+         }
+         ts.push("features", features);
+         ts.push("llvm-target", "i386-unknown-linux-gnu");
+-        ts.push("target-pointer-width", "32");
++        if cfg.rustc_version_atleast(1, 91, 0) {
++            ts.push("target-pointer-width", 32);
++        } else {
++            ts.push("target-pointer-width", "32");
++        }
+     } else if cfg.has("LOONGARCH") {
+         panic!("loongarch uses the builtin rustc loongarch64-unknown-none-softfloat target");
+     } else {