Don't remove the emacs package, as it does build and substitutes are
available. Do remove the guix package though, as it doesn't build due to Guile
memory issues while compiling the package modules.
* etc/release-manifest.scm (%base-packages/armhf): Don't replace the emacs
package, remove the guix package.
(%base-manifest): Remove FIXME comment as %base-packages/armhf doesn't relate
to build power.
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