via erlehmann: Explain why stdout to stderr redirect is necessary for make invocation

reform2-imx8mq/default.imx8mq-mnt-reform2.dtb.do

@@ -44,6 +44,10 @@ redo "${LINUX_D}"/arch/arm64/boot/dts/freescale/imx8mq.dtsi
   git apply "${PATCHFILE}"
  done
 
+ # By default, make writes diagnostic messages to standard out, not
+ # standard error. Therefore we redirect stdout to stderr for make,
+ # as redo would write anything on stdout to the resulting target …
+
  >&2 make -j "$(nproc)" freescale/imx8mq-mnt-reform2.dtb
 )