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/variator_random.c

@@ -47,12 +47,13 @@ SDLVisualTest_GetNextRandomVariation(SDLVisualTest_RandomVariator* variator)
     SDLVisualTest_SUTOptionValue* vars;
     SDLVisualTest_SUTOption* options;
     int i;
+
     if(!variator)
     {
         SDLTest_LogError("variator argument cannot be NULL");
         return NULL;
     }
- 
+
     /* to save typing */
     vars = variator->variation.vars;
     options = variator->config.options;
@@ -106,6 +107,7 @@ void SDLVisualTest_FreeRandomVariator(SDLVisualTest_RandomVariator* variator)
         SDLTest_LogError("variator argument cannot be NULL");
         return;
     }
+
     SDL_free(variator->variation.vars);
     variator->variation.vars = NULL;
-}
+}