Fixed empty parameter list in signatures of internal functions.

src/thread/SDL_thread.c

@@ -121,7 +121,7 @@ static SDL_TLSEntry *SDL_generic_TLS;
 
 
 SDL_TLSData *
-SDL_Generic_GetTLSData()
+SDL_Generic_GetTLSData(void)
 {
     SDL_threadID thread = SDL_ThreadID();
     SDL_TLSEntry *entry;

src/thread/generic/SDL_systls.c

@@ -24,7 +24,7 @@
 
 
 SDL_TLSData *
-SDL_SYS_GetTLSData()
+SDL_SYS_GetTLSData(void)
 {
     return SDL_Generic_GetTLSData();
 }

src/thread/pthread/SDL_systls.c

@@ -32,7 +32,7 @@ static pthread_key_t thread_local_storage = INVALID_PTHREAD_KEY;
 static SDL_bool generic_local_storage = SDL_FALSE;
 
 SDL_TLSData *
-SDL_SYS_GetTLSData()
+SDL_SYS_GetTLSData(void)
 {
     if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) {
         static SDL_SpinLock lock;

src/thread/stdcpp/SDL_systhread.cpp

@@ -153,7 +153,7 @@ SDL_SYS_DetachThread(SDL_Thread * thread)
 
 extern "C"
 SDL_TLSData *
-SDL_SYS_GetTLSData()
+SDL_SYS_GetTLSData(void)
 {
     return SDL_Generic_GetTLSData();
 }

src/thread/windows/SDL_systls.c

@@ -32,7 +32,7 @@ static DWORD thread_local_storage = TLS_OUT_OF_INDEXES;
 static SDL_bool generic_local_storage = SDL_FALSE;
 
 SDL_TLSData *
-SDL_SYS_GetTLSData()
+SDL_SYS_GetTLSData(void)
 {
     if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
         static SDL_SpinLock lock;