Merge pull request swiftlang#37921 from eeckstein/enable-libswift

enable libswift in the macos smoke PR test

Author: eeckstein

utils/build-presets.ini

@@ -632,6 +632,9 @@ swift-primary-variant-arch=x86_64
 # Don't build the benchmarks
 skip-build-benchmarks
 
+# Enable libswift
+libswift
+
 [preset: buildbot_incremental,tools=RA,stdlib=RD,smoketest=macosx,flto]
 mixin-preset=buildbot_incremental,tools=RA,stdlib=RD,smoketest=macosx
 build-subdir=buildbot_incremental
@@ -1508,6 +1511,9 @@ build-swift-stdlib-unittest-extra
 
 libcxx
 
+# Enable libswift
+libswift
+
 # Build llbuild & swiftpm here
 llbuild
 swiftpm