[BOLT][NFC] Delete unused declarations (#72596)

Author: maksfb

bolt/lib/Core/BinaryFunction.cpp

@@ -54,11 +54,9 @@ namespace opts {
 
 extern cl::OptionCategory BoltCategory;
 extern cl::OptionCategory BoltOptCategory;
-extern cl::OptionCategory BoltRelocCategory;
 
 extern cl::opt<bool> EnableBAT;
 extern cl::opt<bool> Instrument;
-extern cl::opt<bool> KeepNops;
 extern cl::opt<bool> StrictMode;
 extern cl::opt<bool> UpdateDebugSections;
 extern cl::opt<unsigned> Verbosity;