setarch does not support ARM architectures. Without this patch,
archbuild fails with this error:
setarch: armv6h: Unrecognized architecture
This patch is similar in intent to the first hunk of
0004-arch-nspawn-arm-fix.patch.
This
- Prevents file conflict errors if `devtools` is installed while
`devtools-alarm` is installed and vice versa.
- Allows `devtools-alarm` to act as a substitute for `devtools` in the
dependency lists of other packages.