Skip libdispatch build for freestanding presets (#35976)

Addresses rdar://74349391

Author: edymtt

utils/build-presets.ini

@@ -2390,6 +2390,7 @@ swift-enable-compatibility-overrides=0
 swift-runtime-macho-no-dyld=1
 swift-stdlib-single-threaded-runtime=1
 swift-stdlib-os-versioning=0
+extra-cmake-options=-DSWIFT_ENABLE_DISPATCH:BOOL=FALSE
 
 [preset: stdlib_S_standalone_minimal_macho_x86_64,build]
 mixin-preset=