* Add option for overclock Super FX at 20 MHz and update selectable options (niuus)
Add an option for overclock Super FX 1 / GSU-1 (MARIO Chip) games to 20 MHz, taken from @niuus' fork of Snes9xGX, called Snes9x RX.
Overclocking to 40 MHz/60 MHz are unstable for these games that used the SFX GSU-1 chip, and makes it unplayable due to too fast speed, so this modification adds this 20MHz overclock option.
* Add option for overclock Super FX at 20 MHz (niuus)
Add an option for overclock Super FX 1 / GSU-1 (MARIO Chip) games to 20 MHz, taken from @niuus' fork of Snes9xGX, called Snes9x RX.
Overclocking to 40 MHz/60 MHz are unstable for these games that used the SFX GSU-1 chip, and makes it unplayable due to too fast speed, so this modification adds this 20MHz overclock option.
* Forgot to update option order for avoid conflict between menus
20ace6b0ed