Remove options.RelaxELFRelocations

This `TargetOption` controls whether LLVM should enable
R_X86_64_GOTPCRELX/R_X86_64_REX_GOTPCRELX relocations,
which are supported by GNU ld versions newer than 2015.
Setting the option to false is no longer necessary.

src/CodeGen_Internal.cpp

@@ -610,7 +610,6 @@ void get_target_options(const llvm::Module &module, llvm::TargetOptions &options
     options.UseInitArray = true;
     options.FloatABIType =
         use_soft_float_abi ? llvm::FloatABI::Soft : llvm::FloatABI::Hard;
-    options.RelaxELFRelocations = false;
     options.MCOptions.ABIName = mabi;
 }