math/p5-Math-GSL-Alien: Improve dependencies
- BUILD_DEPENDS and RUN_DEPENDS are same - move to _BR_DEPENDS.
- Remove TEST_DEPENDS: p5-Test-Simple included in perl, p5-Alien-Build is in BUILD_DEPENDS and RUN_DEPENDS.
- Replace PORTVERSION with DISTVERSION.
PR: 292849
Sponsored by: UNIS Labs
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>