[gn] stub out 68c8c8c (LLDB_BUILD_LLDBRPC)

Author: nico

llvm/utils/gn/secondary/lldb/test/BUILD.gn

@@ -118,6 +118,7 @@ write_lit_cfg("lit_shell_site_cfg") {
     "CLANG_RESOURCE_DIR=",
     "DEFAULT_SYSROOT=",
     "LIBCXX_LIBRARY_DIR=" + rebase_path("$root_build_dir/lib"),
+    "LLDB_BUILD_LLDBRPC=0", # FIXME: add lldb-rpc-gen target, enable
     "LLDB_ENABLE_LUA=0",  # FIXME: gn arg, use in Config.h
     "LLDB_ENABLE_LZMA=0",  # FIXME: gn arg, use in Config.h
     "LLDB_ENABLE_PYTHON=0",  # FIXME: gn arg, use in Config.h