buildMozillaMach: restore macos sdk relax for 142 and later

This was dropped for the beta/devedition update when it didn't apply,
which broke the darwin build, because it went back to requiring a newer
sdk version than we currently ship.

pkgs/build-support/build-mozilla-mach/142-relax-apple-sdk.patch

@@ -0,0 +1,13 @@
+diff --git a/build/moz.configure/toolchain.configure b/build/moz.configure/toolchain.configure
+index 37c00230c853..dd89bea24392 100644
+--- a/build/moz.configure/toolchain.configure
++++ b/build/moz.configure/toolchain.configure
+@@ -233,7 +233,7 @@ with only_when(host_is_osx | target_is_osx):
+     )
+ 
+     def mac_sdk_min_version():
+-        return "15.5"
++        return "15.2"
+ 
+     @depends(
+         "--with-macos-sdk",

pkgs/build-support/build-mozilla-mach/default.nix

@@ -319,6 +319,9 @@ buildStdenv.mkDerivation {
     ++ lib.optionals (lib.versionAtLeast version "139" && lib.versionOlder version "142") [
       ./139-relax-apple-sdk.patch
     ]
+    ++ lib.optionals (lib.versionAtLeast version "142") [
+      ./142-relax-apple-sdk.patch
+    ]
     ++ lib.optionals (lib.versionOlder version "139") [
       # Fix for missing vector header on macOS
       # https://bugzilla.mozilla.org/show_bug.cgi?id=1959377