`install/hardware/apple/fix-spi-keyboard.sh` installs `macbook12-spi-driver-dkms`
on every MacBook it matches. On current kernels that package is obsolete and
**cannot build** — `applespi` has been mainlined, and the out-of-tree copy still
includes a header that no longer exists.

The keyboard works anyway, because the mkinitcpio drop-in the same script writes
pulls in the in-tree module. So the only effect of the package is a failing DKMS
build on every kernel update.

### Evidence

`applespi` ships in the `linux` package:

```
$ pacman -Qo "$(modinfo -n applespi)"
/usr/lib/modules/7.1.9-arch1-2/kernel/drivers/input/keyboard/applespi.ko.zst is owned by linux 7.1.9.arch1-2

$ tar -tf linux-7.1.9.tar.xz | grep applespi
linux-7.1.9/drivers/input/keyboard/applespi.c
linux-7.1.9/drivers/input/keyboard/applespi.h
linux-7.1.9/drivers/input/keyboard/applespi_trace.h
```

It is also the only `applespi` on disk — the DKMS build never produces one:

```
$ find /lib/modules/7.1.9-arch1-2 -name 'applespi*'
/lib/modules/7.1.9-arch1-2/kernel/drivers/input/keyboard/applespi.ko.zst
```

The build failure, from `/var/lib/dkms/macbook12-spi-driver/0+git.315/build/make.log`:

```
   64 | #include <asm/unaligned.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.
make[4]: *** [scripts/Makefile.build:289: applespi.o] Error 1
make[4]: *** [scripts/Makefile.build:289: apple-ibridge.o] Error 1
```

`asm/unaligned.h` was removed in 6.12; it is `linux/unaligned.h` now, and the
kernel tree confirms there is no `arch/x86/include/asm/unaligned.h` in 7.1.9.

As seen during a pacman transaction:

```
(3/3) Install DKMS modules
==> dkms install --no-depmod macbook12-spi-driver/0+git.315 -k 7.1.9-arch1-2
Error! Bad return status for module build on kernel: 7.1.9-arch1-2 (x86_64)
==> WARNING: `dkms install --no-depmod macbook12-spi-driver/0+git.315 -k 7.1.9-arch1-2' exited 10
```

### Why this is currently invisible

On a stock install `linux-headers` isn't present, so Arch's DKMS hook globs
`usr/lib/modules/*/build`, matches nothing, builds nothing and exits 0. The
package sits at `added` and never errors:

```
$ dkms status
macbook12-spi-driver/0+git.315: added
```

The failure only surfaces the moment `linux-headers` gets installed for any
reason.

**This interacts with #8285.** That issue proposes installing `linux-headers`
explicitly (for the CS8409 audio driver) and describes the same zero-kernel
glob behaviour. If it lands, every matched MacBook starts surfacing this failed
build on each kernel update. Fixing this first would avoid shipping that
regression.

### Steps to reproduce

1. Install Omarchy on a machine matching the regex (MacBookPro14,1 here).
2. `sudo pacman -S linux-headers`
3. Observe the DKMS build fail in the pacman output, and on every kernel update after.

### Expected

Either don't install `macbook12-spi-driver-dkms` on kernels that ship `applespi`
in-tree, or drop it entirely and rely on the mkinitcpio drop-in.

### Important: the drop-in must stay

The other half of the script is load-bearing and should not be removed along
with the package:

```
/etc/mkinitcpio.conf.d/macbook_spi_modules.conf
MODULES=(applespi intel_lpss_pci spi_pxa2xx_platform)
```

On a LUKS root the keyboard has to be in the initramfs to type the passphrase
(cf. #1313). Removing only the package is safe — pacman owns just
`/usr/src/macbook12-spi-driver-0+git.315/`, not the drop-in — and the keyboard
and trackpad keep working:

```
$ sudo pacman -R macbook12-spi-driver-dkms
$ grep '^N: Name' /proc/bus/input/devices | grep -i apple
N: Name="Apple SPI Keyboard"
N: Name="Apple SPI Touchpad"
```

### System

| | |
|---|---|
| Omarchy | 4.0.2-1 (stable) |
| Model | MacBookPro14,1 |
| CPU | Intel Core i5-7360U |
| GPU | Intel Iris Plus Graphics 640 [8086:5926] |
| Kernel | 7.1.9-arch1-2 |
| dkms | 3.4.3-2 |
| package | macbook12-spi-driver-dkms 0+git.315-1 |