iidx,sdvx: detect SuperstepSound init failures and log a message upon crash (#376)

## Link to GitHub Issue, if one exists
#345 

## Description of change
If we see SuperstepSound failure during boot, remember it, and when the
game eventually crashes, log a series of warning messages to surface why
the game likely failed to launch.

## Testing
Tested both iidx and sdvx with an audio device set to not allow
exclusive mode.

src/spice2x/games/iidx/iidx.cpp

@@ -27,6 +27,7 @@
 #include "util/memutils.h"
 #include "util/sigscan.h"
 #include "util/utils.h"
+#include "launcher/signal.h"
 
 #include "external/robin_hood.h"
 
@@ -232,6 +233,9 @@ namespace games::iidx {
         } else if (data.find(" W:touch: missing trigger:") != std::string::npos) {
             out.clear();
             return true;
+        } else if (data.find("SuperstepSound: Audio device is not available") != std::string::npos) {
+            launcher::signal::SUPERSTEP_SOUND_ERROR = TRUE;
+            return false;
         } else {
             return false;
         }