[gn] port enough of 2914a4b (lldb Interfaces)

Summary:
gn's lldb does not have the Python plugin, so most of the changes
from 2914a4b aren't necessary here.

Test Plan: 

Reviewers: 

Subscribers: 

Tasks: 

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Differential Revision: https://phabricator.intern.facebook.com/D60250738

Author: nico

llvm/utils/gn/secondary/lldb/source/Interpreter/BUILD.gn

@@ -15,6 +15,7 @@ static_library("Interpreter") {
   deps = [
     ":InterpreterProperties",
     ":InterpreterPropertiesEnum",
+    "Interfaces",
     "//lldb/source/Commands",
     "//lldb/source/Core",
     "//lldb/source/DataFormatters",

llvm/utils/gn/secondary/lldb/source/Interpreter/Interfaces/BUILD.gn

@@ -0,0 +1,9 @@
+static_library("Interfaces") {
+  output_name = "lldbInterpreterInterfaces"
+  configs += [ "//llvm/utils/gn/build:lldb_code" ]
+  deps = [
+    "//lldb/source/Utility",
+    "//llvm/lib/Support",
+  ]
+  sources = [ "ScriptedInterfaceUsages.cpp" ]
+}