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GH-37208: [R] Use currrently running R binary to compile test program (nix install) (#37225)

### Rationale for this change

See #37208.

### What changes are included in this PR?

Use the currrently running R binary to compile test program (nix install).

### Are these changes tested?

No. Installation.

### Are there any user-facing changes?

No

* Closes: #37208

Lead-authored-by: Bruno Tremblay <bruno@boostao.ca>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Co-authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>