Add Mahjong Fight Girl Support (#275)

## Link to GitHub Issue, if one exists
n/a

## Description of change
Adds Mahjong Fight Girl Support

## Compiling
+

## Testing
Tested with VFG:J:E:A:2024100800 in HG mode with VFG IO. No
modifications made to data, other than avs-config.xml and
ea3-config.xml. B and C modes don't work because of serial touchscreen.
UKS mode doesn't work because of IO.

src/spice2x/launcher/signal.h

@@ -4,6 +4,7 @@ namespace launcher::signal {
 
     // settings
     extern bool DISABLE;
+    extern bool USE_VEH_WORKAROUND;
 
     //void print_stacktrace();
     void attach();