LLD patch: skip building docs

This allows us to delete the lld/docs directory from zig-bootstrap.

Author: andrewrk

lld/CMakeLists.txt

@@ -200,7 +200,6 @@ if (LLVM_INCLUDE_TESTS)
   add_subdirectory(test)
 endif()
 
-add_subdirectory(docs)
 add_subdirectory(COFF)
 add_subdirectory(ELF)
 add_subdirectory(MachO)