Bring back SDL1 support

[meepingsnesroms]

I have been trying to get Neko Project 2 Kai running on the GKD350H and see it even has an opendingux port for the GCW0 but my device dosent have a GPU or SDL2 libs and I was told it used to have SDL1 support:
https://boards.dingoonity.org/ingenic-jz4760-devices/gkd350h-missing-sdl2-librarys/

[AZO234]

First of all, I'm lightly supporting back support for SDL1.2.
Now link is complete.

However, there are some not work properly.
Probably must be implemented carefully.

Please wait a moment.

Regards.

[AZO234]

Support for SDL1 has been completed.
(I do not know how to create a binary for GKD350H)

Please tell me to meet your expectations!

[AZO234]

I modified for RS90? Dingux series? GKD350H?
I used rs90's toolchain for making .opk file.

There are two NP2kai types.
One is NP2kai(PC9801 i286 specs), other one is NP21kai(PC9821 IA-32 specs).
Can you check those building/runnning?

Regard.

[yksoft1]

I have an RS-90 Retro Mini with OpenDingux installed. I don't think NP21 would run on it (its CPU is only 360MHz), and it had a screen too small (240x160 GBA native resolution).

[AZO234]

I think shrink screen is a bit unuseful.
Because NP2 is PC98(PC) emulator, character is important.
I think it need at least VGA.

[yksoft1]

I currently have an RS-90, a GKD350H and a Miyoo handheld (Allwinner SoC based). If @AZO234 would like to do ports for such systems, I can help testing.

[AZO234]

Thanks.
I wanna get these hardware!💕
If you have any problems, please send pull request.