Merge pull request #64689 from edymtt/no-libcxx-in-macos-toolchain-5.9

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

Author: shahmishal

utils/build-presets.ini

@@ -1265,7 +1265,6 @@ swift-driver
 swiftsyntax
 swiftformat
 playgroundsupport
-libcxx
 indexstore-db
 sourcekit-lsp
 swiftdocc
@@ -1308,7 +1307,6 @@ install-swiftpm
 install-swift-driver
 install-swiftsyntax
 install-playgroundsupport
-install-libcxx
 install-sourcekit-lsp
 install-swiftformat
 install-swiftdocc