Swift: enable VSCode to build extractor via CMake

The `-arch=x86_64` from `swift/rules.bzl` turns out to be unnecessary,
even on Arm-based Macs.

.vscode/settings.json

@@ -1,3 +1,5 @@
 {
-    "omnisharp.autoStart": false
+  "omnisharp.autoStart": false,
+  "cmake.sourceDirectory": "${workspaceFolder}/swift",
+  "cmake.buildDirectory": "${workspaceFolder}/bazel-cmake-build"
 }

swift/CMakeLists.txt

@@ -9,6 +9,10 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_C_COMPILER clang)
 set(CMAKE_CXX_COMPILER clang++)
 
+if(APPLE)
+    set(CMAKE_OSX_ARCHITECTURES x86_64) # temporary until we can build a Universal Binary
+endif()
+
 project(codeql)
 
 include(../misc/bazel/cmake/setup.cmake)

swift/rules.bzl

@@ -5,11 +5,7 @@ def _wrap_cc(rule, kwargs):
     _add_args(kwargs, "copts", [
         # Required by LLVM/Swift
         "-fno-rtti",
-    ] + select({
-        # temporary, before we do universal merging and have an arm prebuilt package, we make arm build x86
-        "@platforms//os:macos": ["-arch=x86_64"],
-        "//conditions:default": [],
-    }))
+    ])
     _add_args(kwargs, "features", [
         # temporary, before we do universal merging
         "-universal_binaries",