Swift: only run Xcode autobuilder on macOS

swift/BUILD.bazel

@@ -84,8 +84,12 @@ pkg_filegroup(
     srcs = [
         ":extractor",
         ":swift-test-sdk-arch",
-        ":xcode-autobuilder",
-    ],
+    ] + select({
+        "@platforms//os:linux": [],
+        "@platforms//os:macos": [
+            ":xcode-autobuilder"
+        ],
+    }),
     visibility = ["//visibility:public"],
 )
 

swift/tools/autobuild.sh

@@ -1,3 +1,8 @@
 #!/bin/bash
 
-exec "${CODEQL_EXTRACTOR_SWIFT_ROOT}/tools/${CODEQL_PLATFORM}/xcode-autobuilder"
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  exec "${CODEQL_EXTRACTOR_SWIFT_ROOT}/tools/${CODEQL_PLATFORM}/xcode-autobuilder"
+else
+	echo "Not implemented yet"
+  exit 1
+fi