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Snes9x2005 Non-Plus: Add optional low pass audio filter

platform/miyoo: Use optimised build flags

PS3/PSL1GHT Makefile update

Fix audio sample pacing

Opt-in to FAST_ALIGNED_LSB_WORD_ACCESS optimisation which was actually
backported to a standalone fork in m45t3r/snes9x4d@cf6dedb1. Speeds up
some CPU and PPU operations.

Similarly, stop unrolling loops as in m45t3r/snes9x4d@8a342cde to help
small CPU cache devices like the Miyoo.

Use the gcc built-in function, making the operation constant-time and
branch-free.

Use {READ,WRITE}_WORD so that it copies by word on little-endian
platforms. Mark a LUT const for const-correctness.

Fix regression introduced in snes9x-1.40.

As it's only incremented here and then reset to 0, avoids integer
division, which can be be expensive on CPUs without this instruction
such as pre-ARMv7 classic ARMs.

Call S9xSoftReset() instead of S9xReset(), like newer Snes9x cores do

add Miyoo target

Replace direct direct file access with VFS routines

This reverts commit 0cc36302.

* Update to core options v2 - add Emulation Hacks category