minimal fixes to visual test, so that it actually builds w/o warnings:

- linux_process.c: add an SDLVisualTest_ScreenshotProcess() stub for
  linux builds succeed.
- action_configparser.c: fixes -Wswitch warnings.
- testharness.c: fixes 'is used uninitialized' warnings for userevents.
- testharness.c: fixes format string argument to 'Force killing...'
- testquit.c: fix type of options array in main().
- windows_screenshot.c: lowercase windows.h header name.
- ran dos2unix on all sources and add missing newlines at files' ends.
- minor adjustments to autotools build system (which actually seems to
  need more surgery for unnecessary stuff...)

visualtest/src/variators.c

@@ -53,6 +53,7 @@ SDLVisualTest_GetNextVariation(SDLVisualTest_Variator* variator)
         SDLTest_LogError("variator argument cannot be NULL");
         return NULL;
     }
+
     switch(variator->type)
     {
         case SDL_VARIATOR_EXHAUSTIVE:
@@ -77,6 +78,7 @@ void SDLVisualTest_FreeVariator(SDLVisualTest_Variator* variator)
         SDLTest_LogError("variator argument cannot be NULL");
         return;
     }
+
     switch(variator->type)
     {
         case SDL_VARIATOR_EXHAUSTIVE:
@@ -90,4 +92,4 @@ void SDLVisualTest_FreeVariator(SDLVisualTest_Variator* variator)
         default:
             SDLTest_LogError("Invalid value for variator type");
     }
-}
+}