cmake,meson: fix inclusion of GPG info in Git commit info (#12302)

This manifested for me as a failure to build plugins with `hyprpm`, but
the root cause was GPG data getting incorporated into `src/version.h`,
like so:

```c
#define GIT_COMMIT_MESSAGE "gpg: Signature made Sun 09 Nov 2025 03:31:36 PM PST
gpg:                using EDDSA key E26A4A2AB9676F54149F8EAA665806380871D640
gpg: Can't check signature: No public key
version: bump to 0.52.1"
```

This affected both `GIT_COMMIT_MESSAGE` and `GIT_COMMIT_DATE`, since
those are generated via `git show` (which can generate that extra GPG
info if the user's personal Git config sets `log.showSignature`).

See: https://github.com/hyprwm/Hyprland/discussions/12282

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