Upgrade cmake to v0.1.50

This is the latest version. Now that the cc crate has been successfully
upgraded, we should upgrade cmake as well, as v0.1.48 is now over 2
years old.

cmake v1.0.49 requires CMAKE_SYSTEM_NAME to be set when cross-compiling,
so ensure that we do this for supported Apple OSes.

src/bootstrap/Cargo.lock

@@ -157,9 +157,9 @@ checksum = "702fc72eb24e5a1e48ce58027a675bc24edd52096d5397d4aea7c6dd9eca0bd1"
 
 [[package]]
 name = "cmake"
-version = "0.1.48"
+version = "0.1.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8ad8cef104ac57b68b89df3208164d228503abbdce70f6880ffa3d970e7443a"
+checksum = "a31c789563b815f77f4250caee12365734369f942439b7defd71e18a48197130"
 dependencies = [
  "cc",
 ]

src/bootstrap/Cargo.toml

@@ -37,7 +37,7 @@ test = false
 # bootstrap codebase(e.g., https://github.com/rust-lang/rust/issues/124565);
 # otherwise, some targets will fail. That's why these dependencies are explicitly pinned.
 cc = "=1.0.97"
-cmake = "=0.1.48"
+cmake = "=0.1.50"
 
 build_helper = { path = "../tools/build_helper" }
 clap = { version = "4.4", default-features = false, features = ["std", "usage", "help", "derive", "error-context"] }

src/bootstrap/src/core/build_steps/llvm.rs

@@ -631,6 +631,16 @@ fn configure_cmake(
             cfg.define("CMAKE_SYSTEM_NAME", "SunOS");
         } else if target.contains("linux") {
             cfg.define("CMAKE_SYSTEM_NAME", "Linux");
+        } else if target.contains("darwin") {
+            cfg.define("CMAKE_SYSTEM_NAME", "Darwin");
+        } else if target.contains("ios") {
+            cfg.define("CMAKE_SYSTEM_NAME", "iOS");
+        } else if target.contains("tvos") {
+            cfg.define("CMAKE_SYSTEM_NAME", "tvOS");
+        } else if target.contains("watchos") {
+            cfg.define("CMAKE_SYSTEM_NAME", "watchOS");
+        } else if target.contains("visionos") {
+            cfg.define("CMAKE_SYSTEM_NAME", "visionOS");
         } else {
             builder.info(&format!(
                 "could not determine CMAKE_SYSTEM_NAME from the target `{target}`, build may fail",