[Buildroot] Where is mtd/mtd-user.h supposed to come from?

[Grant Edwards]

The build of uboot's fw_env target tool is failing because
there is no mtd/mtd-user.h file.

Where is the mtd include directory supposed to come from?

Is it supposed to come from the kernel-headers or from the mtd
package?

It's present in both, but never gets copied into the toolchain
include tree when the toolchainis built, nor into the staging
include tree when mtd is built.

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