[gn] port 8a27ef6 (lldbSymbol now includes clang headers)

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Differential Revision: https://phabricator.intern.facebook.com/D60251480

Author: nico

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

@@ -1,6 +1,9 @@
 static_library("Symbol") {
   output_name = "lldbSymbol"
-  configs += [ "//llvm/utils/gn/build:lldb_code" ]
+  configs += [
+    "//llvm/utils/gn/build:clang_code",
+    "//llvm/utils/gn/build:lldb_code",
+  ]
   deps = [
     "//lldb/source/Core",
     "//lldb/source/Expression",