Migrate use of xcode_config_alias

Use the recently-introduced skylark late bound default instead.

PiperOrigin-RevId: 186043411

src/TulsiGenerator/Bazel/tulsi/tulsi_aspects.bzl

diff --git a/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects.bzl b/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects.bzl
index 47a5a6c..4fed8bf 100644
--- a/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects.bzl
+++ b/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects.bzl
@@ -22,7 +22,6 @@
     ':tulsi_aspects_paths.bzl',
      'AppleBundleInfo',
      'IosExtensionBundleInfo',
-     'TULSI_CURRENT_XCODE_CONFIG',
 )
 
 # List of all of the attributes that can link from a Tulsi-supported rule to a
@@ -878,7 +877,8 @@
 tulsi_sources_aspect = aspect(
     implementation=_tulsi_sources_aspect,
     attrs = {
-        '_tulsi_xcode_config': attr.label(default=TULSI_CURRENT_XCODE_CONFIG) },
+        '_tulsi_xcode_config': attr.label(default=configuration_field(
+            fragment="apple", name="xcode_config_label")) },
     attr_aspects=_TULSI_COMPILE_DEPS,
     fragments=['apple', 'cpp', 'objc'],
 )

src/TulsiGenerator/Bazel/tulsi/tulsi_aspects_paths.bzl

diff --git a/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects_paths.bzl b/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects_paths.bzl
index 0017549..c5e0266 100644
--- a/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects_paths.bzl
+++ b/src/TulsiGenerator/Bazel/tulsi/tulsi_aspects_paths.bzl
@@ -26,6 +26,3 @@
 # Re-export providers.
 AppleBundleInfo = _AppleBundleInfo
 IosExtensionBundleInfo = _IosExtensionBundleInfo
-
-# Export labels to paths.
-TULSI_CURRENT_XCODE_CONFIG = Label('@bazel_tools//tools/osx:current_xcode_config')