Update find_ld.m4 for more robust lld detection

m4/find_ld.m4

@@ -39,7 +39,8 @@ AC_DEFUN([FIND_LD],[
                        AC_MSG_NOTICE([Using ld.gold and assuming that it is not affected by binutils issue 22266]);
                    fi
                    ;;
-              "LLD"*)
+              # NOTE: we get "Debian LLD ..." from the llvm-13 bullseye debs, for instance:
+              *"LLD"*)
                    FP_CC_LINKER_FLAG_TRY(lld, $2) ;;
               *) AC_MSG_NOTICE([unknown linker version $out]) ;;
             esac