feat: archive full dolphin-emu/Sys, add DSP/font/IPL paths to pack

dolphin-emu/Sys/ folder (2562 files) from libretro/dolphin Data/Sys.
retroarch.yml: DSP firmware (dsp_coef.bin, dsp_rom.bin), fonts
(font_western.bin, font_japanese.bin) at dolphin-emu/Sys/GC/ paths.
ref: DolphinLibretro/Boot.cpp:72-73, HW/DSPLLE/DSPHost.cpp,
HW/EXI/EXI_DeviceIPL.cpp. pack: 452 files, 0 missing.

bios/Nintendo/GameCube/dolphin-emu/Sys/GameSettings/GC8JA4.ini

@@ -0,0 +1,25 @@
+# GC8JA4 - ｸﾗｯｼｭ･ﾊﾞﾝﾃﾞｨｸｰ 爆走！ニトロカート
+
+[Core]
+# Values set here will override the main Dolphin settings.
+
+[OnFrame]
+# Add memory patches to be applied every frame here.
+
+[ActionReplay]
+# Add action replay cheats here.
+$Fix C4 texture tiling (used for buttons and some character icons)
+0400328C 7D0340AE
+04003290 5108452E
+04003294 5508E13E
+04003298 4E800020
+040CA1B4 4BF390D9
+
+[Video_Settings]
+
+[Video_Hacks]
+# Avoids black screen FMVs, flickering in menus, and broken loading screens.
+ImmediateXFBEnable = False
+
+[AR_RetroAchievements_Verified]
+$Fix C4 texture tiling (used for buttons and some character icons)