Remove use_llvm_api related checks and other related things

src/main.cpp

@@ -1185,7 +1185,6 @@ bool parse_build_flags(Array<String> args) {
 
 						case BuildFlag_UseLLVMApi:
 							gb_printf_err("-llvm-api flag is not required any more\n");
-							build_context.use_llvm_api = true;
 							bad_flags = true;
 							break;