Bug#1038012: a7xpg: Depends on SDL 1.2

[Simon McVittie]

On Thu, 15 Jun 2023 at 12:27:12 +0100, Simon McVittie wrote:
> 4. Install libsdl1.2-compat-dev and recompile the package.

I tested this on a porterbox and it builds fine. (I didn't test the
resulting binaries.)

    smcv