[gn] port fc4d871

Author: nico

llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn

@@ -290,6 +290,7 @@ write_cmake_config("llvm-config") {
   values = [
     "LLVM_BUILD_LLVM_DYLIB=",
     "LLVM_BUILD_SHARED_LIBS=",
+    "LLVM_BUILD_TELEMETRY=",
     "LLVM_DEFAULT_TARGET_TRIPLE=$llvm_target_triple",
     "LLVM_ENABLE_DUMP=",
     "LLVM_ENABLE_HTTPLIB=",