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GH-43591: [C++][GLib] Don't install arrow-cuda.pc/arrow-cuda-glib.pc on Windows (#43593)

### Rationale for this change

Because `cuda.pc` that is required by `arrow-cuda.pc` doesn't exist on Windows.

### What changes are included in this PR?

Don't install `arrow-cuda.pc`/`arrow-cuda-glib.pc` on Windows. Users should use ArrowCUDA CMake package instead of pkg-config on Windows. 

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #43591

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>