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/windows/windows_process.c

@@ -1,11 +1,10 @@
 /* See LICENSE.txt for the full license governing this code. */
 /**
- * \file windows_process.c 
+ * \file windows_process.c
  *
  * Source file for the process API on windows.
  */
 
-
 #include <SDL.h>
 #include <SDL_test.h>
 #include <string.h>