When I tried to add the schedutils portion of util-linux to my build, I noticed that that it wasn't getting built on the target. Further investigation shows that the culprit was the --disable-all-programs that was turned on if the basic binaries option (BR2_PACKAGE_UTIL_LINUX_BINARIES) was not set. If --disable-all-programs is set, the schedutils will not be built. This is not the case for other options like mount, which *do* get built. This is probably a autoconf bug in util-linux. Version is git commit c77f7c689ffc8c5fd139e4622bd6f9d315bbc254, which is just after the disable-all-programs change landed.
I confirmed that this is an autoconf bug, so let's move the discussion to the util-linux forum.
Waiting for application of solution submitted to patchwork: http://patchwork.ozlabs.org/patch/729458/
Fixed by https://git.buildroot.org/buildroot/commit/?id=125213d6164a395f7d0bfb136f3a873a02630ebc. Thanks Carlos for having investigated and fixed the issue!