Fixes:
```
.../aarch64-unknown-linux-gnu-ld.bfd: warning: /build/source/build/rk3399/release/bl31/bl31.elf has a LOAD segment with RWX permissions
.../aarch64-unknown-linux-gnu-ld.bfd: warning: /build/source/build/rk3399/release/bl31/bl31.elf has a LOAD segment with RWX permissions
.../aarch64-unknown-linux-gnu-ld.bfd: warning: /build/source/build/rk3399/release/bl31/bl31.elf has a LOAD segment with RWX permissions
make: *** [Makefile:1306: /build/source/build/rk3399/release/bl31/bl31.elf] Error 1
```
See: https://developer.trustedfirmware.org/T996
This commit fixes the problem reported in issue #177572.
Turns out that re-adding this line, which was removed in commit
526238b288, fixes the problem.
The CUPS backend was not built since gutenprint requires libusb1, not 0.1 (at least since ~2014).
With this change CUPS detects printers relying on the pure gutenprint backend (like some dye sublimation printers).
The arm-trusted-firmware/default.nix expression exposes
`buildArmTrustedFirmware` and its `version?"2.7"` field to
`top-level/all-packages.nix`. Unfortunately it doesn't work.
Changing the version field doesn't change what version of the ATF
source code is used. Attempting to "lock" an installation to a
specific version by overriding this field (e.g. version="2.7") won't
work either; when nixpkgs bumps the version to 2.8 the user will end
up building the 2.8 source code but the resulting expression will be
labeled misleadingly in the store:
```
/nix/store/eeee...-arm-trusted-firmware-2.7/
```
**using the 2.8 source code**. So not only does `version` not lock
the version, it will actually *conceal* the fact that the underlying
source code has been upgraded!
Let's just remove the `version` field. It doesn't work and never did.
https://github.com/NixOS/nixpkgs/pull/185004#discussion_r939526830
Co-authored-by: Sandro <sandro.jaeckel@gmail.com>
rnhmjoj