SR-6084: libdispatch.so missing from snapshot builds
SR-6084: libdispatch.so missing from snapshot builds

Adjust install path for libdispatch in CMakelists.txt

apple/swift-corelibs-libdispatch,apple/swift-corelibs-libdispatch,apple/swift-corelibs-libdispatch,apple/swift-corelibs-libdispatch