Warnings: fix a documentation warning and missing prototypes

include/SDL_syswm.h

@@ -34,7 +34,7 @@
 #include "SDL_version.h"
 
 /**
- *  \file SDL_syswm.h
+ *  \brief SDL_syswm.h
  *
  *  Your application has access to a special type of event ::SDL_SYSWMEVENT,
  *  which contains window-manager specific information and arrives whenever

include/SDL_test_memory.h

@@ -42,14 +42,14 @@ extern "C" {
  * 
  * \note This should be called before any other SDL functions for complete tracking coverage
  */
-int SDLTest_TrackAllocations();
+int SDLTest_TrackAllocations(void);
 
 /**
  * \brief Print a log of any outstanding allocations
  *
  * \note This can be called after SDL_Quit()
  */
-void SDLTest_LogAllocations();
+void SDLTest_LogAllocations(void);
 
 
 /* Ends C function definitions when using C++ */

src/render/software/SDL_render_sw.c

@@ -820,7 +820,7 @@ SW_CreateRendererForSurface(SDL_Surface * surface)
     return renderer;
 }
 
-SDL_Renderer *
+static SDL_Renderer *
 SW_CreateRenderer(SDL_Window * window, Uint32 flags)
 {
     SDL_Surface *surface;

src/thread/pthread/SDL_systhread.c

@@ -49,6 +49,7 @@
 #include "SDL_log.h"
 #include "SDL_platform.h"
 #include "SDL_thread.h"
+#include "SDL_system.h"
 #include "../SDL_thread_c.h"
 #include "../SDL_systhread.h"
 #ifdef __ANDROID__