[gn build] Port d9ec4b2

Author: llvmgnsyncbot

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

@@ -62,6 +62,7 @@ target(liblldb_type, "liblldb") {
  "SBFile.cpp",
  "SBFileSpec.cpp",
  "SBFileSpecList.cpp",
+ "SBFormat.cpp",
  "SBFrame.cpp",
  "SBFunction.cpp",
  "SBHostOS.cpp",