sysutils/elephant: update to 2.1.4

While here, add aarch64 and armv7 to unsupported architectures since
buildmode=plugin is not supported on them on FreeBSD.

Changelog:

• https://github.com/abenz1267/elephant/releases/tag/v1.3.3
• https://github.com/abenz1267/elephant/releases/tag/v2.0.0
• https://github.com/abenz1267/elephant/releases/tag/v2.1.0
• https://github.com/abenz1267/elephant/releases/tag/v2.1.1
• https://github.com/abenz1267/elephant/releases/tag/v2.1.2
• https://github.com/abenz1267/elephant/releases/tag/v2.1.3
• https://github.com/abenz1267/elephant/releases/tag/v2.1.4

Reported by: GitHub (watch releases)