Don't build MachO2 support in lld.  This code reaches into libunwind
internals.

Index: tools/lld/tools/lld/CMakeLists.txt
--- tools/lld/tools/lld/CMakeLists.txt.orig
+++ tools/lld/tools/lld/CMakeLists.txt
@@ -15,7 +15,6 @@ target_link_libraries(lld
   lldCOFF
   lldDriver
   lldELF
-  lldMachO2
   lldMinGW
   lldWasm
   )
