Merge pull request #64687 from edymtt/no-libcxx-in-macos-toolchains

Don't build and install libcxx when generating a macOS toolchain

Author: shahmishal

utils/build-presets.ini

@@ -1271,7 +1271,6 @@ swift-driver
 swiftsyntax
 swiftformat
 playgroundsupport
-libcxx
 indexstore-db
 sourcekit-lsp
 swiftdocc
@@ -1314,7 +1313,6 @@ install-swiftpm
 install-swift-driver
 install-swiftsyntax
 install-playgroundsupport
-install-libcxx
 install-sourcekit-lsp
 install-swiftformat
 install-swiftdocc