emulators/amiberry8.3.0

emulators/amiberry: enable on powerpc64*

Drop the include of the missing eigccppc.h, treat powerpc64 as a 64-bit
CPU and use the nzcv flag layout on PowerPC.  Merged upstream as
d3c6ca8debc2.  PCem is x86-only.

While here, fix the spelling of riscv64 in OPTIONS_EXCLUDE.

emulators/amiberry: update to 8.3.0

Fixed armv7 build failures
Fixed linking issues
Fixed WITH_OPTIMISE option
added support for QEMU UAE PPC Plugin

Changelog: https://github.com/BlitterStudio/amiberry/releases/tag/v8.3.0

Signed-off-by:	polyduekes <polyduekes@proton.me>
PR:		298601

emulators/amiberry: Update to 8.1.5

Changelog: https://github.com/BlitterStudio/amiberry/releases/tag/v8.1.5

PR:		294710
Event:		Wiesbaden Hackathon 202604

*/*: Bump PORTREVISION. audio/portmidi was updated to 2.0.8

emulators/amiberry: New port: Optimised Amiga emulator

Amiberry is an optimized Amiga emulator for Intel/AMD, ARM (32bit and
64bit) and RISC-V platforms.
The core emulation comes from WinUAE, and even the main GUI is designed
to look similar to that. It includes JIT support to get high-performance
results on CPU-intensive emulated environments, like desktop
applications. On top of that, there are some unique features developed
specifically for Amiberry, such as the WHDLoad booter, support for
RetroArch controller mapping, and several more.

https://amiberry.com/
https://github.com/BlitterStudio/amiberry/

PR:		289403
Co-authored-by:	Yusuf Yaman <nxjoseph@protonmail.com>