emacs: make trivialBuild respect error tunables at bytecompile time (#394546)

            foundMakefile=1

          fi

          emacs -l package -f package-initialize -L . --batch -f batch-byte-compile *.el

          emacs -l package -f package-initialize \

            --eval "(setq byte-compile-debug ${if finalAttrs.ignoreCompilationError then "nil" else "t"})" \

            --eval "(setq byte-compile-error-on-warn ${

              if finalAttrs.turnCompilationWarningToError then "t" else "nil"

            })" \

            -L . --batch -f batch-byte-compile *.el

          runHook postBuild

        '';