llama-cpp: remove git build dependency

`git` is used in upstream build system to determine the package version
from git history depth. We are not running from a git checkout, so `git`
is useless. (We handle version calculation during `src` preparation.)

Moreover, having `git` in the build scope results in versions captured
in `cmake` files as `unknown` / `dirty`.

pkgs/by-name/ll/llama-cpp/package.nix

@@ -36,7 +36,6 @@
   vulkan-headers,
   vulkan-loader,
   ninja,
-  git,
 }:
 
 let
@@ -92,7 +91,6 @@ effectiveStdenv.mkDerivation (finalAttrs: {
     cmake
     ninja
     pkg-config
-    git
   ]
   ++ optionals cudaSupport [
     cudaPackages.cuda_nvcc