Fix warning for Android NDK compiler: "function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]"

https://stackoverflow.com/questions/42125/warning-error-function-declaration-isnt-a-prototype
In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing.

src/audio/arts/SDL_artsaudio.c

@@ -86,7 +86,7 @@ static struct
 
 #undef SDL_ARTS_SYM
 
-static void UnloadARTSLibrary()
+static void UnloadARTSLibrary(void)
 {
     if (arts_handle) {
         SDL_UnloadObject(arts_handle);
@@ -119,7 +119,7 @@ static int LoadARTSLibrary(void)
 
 #else
 
-static void UnloadARTSLibrary()
+static void UnloadARTSLibrary(void)
 {
     return;
 }

src/audio/esd/SDL_esdaudio.c

@@ -64,7 +64,7 @@ static struct
 
 #undef SDL_ESD_SYM
 
-static void UnloadESDLibrary()
+static void UnloadESDLibrary(void)
 {
     if (esd_handle) {
         SDL_UnloadObject(esd_handle);
@@ -96,7 +96,7 @@ static int LoadESDLibrary(void)
 
 #else
 
-static void UnloadESDLibrary()
+static void UnloadESDLibrary(void)
 {
     return;
 }

src/audio/fusionsound/SDL_fsaudio.c

@@ -77,7 +77,7 @@ static struct
 
 #undef SDL_FS_SYM
 
-static void UnloadFusionSoundLibrary()
+static void UnloadFusionSoundLibrary(void)
 {
     if (fs_handle) {
         SDL_UnloadObject(fs_handle);
@@ -110,7 +110,7 @@ static int LoadFusionSoundLibrary(void)
 
 #else
 
-static void UnloadFusionSoundLibrary()
+static void UnloadFusionSoundLibrary(void)
 {
     return;
 }

src/audio/pipewire/SDL_pipewire.c

@@ -142,13 +142,13 @@ static int pipewire_dlsym(const char *fn, void **addr)
         return -1;                                             \
     }
 
-static int load_pipewire_library()
+static int load_pipewire_library(void)
 {
     pipewire_handle = SDL_LoadObject(pipewire_library);
     return pipewire_handle ? 0 : -1;
 }
 
-static void unload_pipewire_library()
+static void unload_pipewire_library(void)
 {
     if (pipewire_handle) {
         SDL_UnloadObject(pipewire_handle);
@@ -160,18 +160,18 @@ static void unload_pipewire_library()
 
 #define SDL_PIPEWIRE_SYM(x) PIPEWIRE_##x = x
 
-static int load_pipewire_library()
+static int load_pipewire_library(void)
 {
     return 0;
 }
 
-static void unload_pipewire_library()
+static void unload_pipewire_library(void)
 { /* Nothing to do */
 }
 
 #endif /* SDL_AUDIO_DRIVER_PIPEWIRE_DYNAMIC */
 
-static int load_pipewire_syms()
+static int load_pipewire_syms(void)
 {
     SDL_PIPEWIRE_SYM(pw_get_library_version);
     SDL_PIPEWIRE_SYM(pw_init);
@@ -212,7 +212,7 @@ SDL_FORCE_INLINE SDL_bool pipewire_version_at_least(int major, int minor, int pa
            (pipewire_version_major > major || pipewire_version_minor > minor || pipewire_version_patch >= patch);
 }
 
-static int init_pipewire_library()
+static int init_pipewire_library(void)
 {
     if (!load_pipewire_library()) {
         if (!load_pipewire_syms()) {
@@ -234,7 +234,7 @@ static int init_pipewire_library()
     return -1;
 }
 
-static void deinit_pipewire_library()
+static void deinit_pipewire_library(void)
 {
     PIPEWIRE_pw_deinit();
     unload_pipewire_library();
@@ -340,7 +340,7 @@ static void io_list_remove(Uint32 id)
     }
 }
 
-static void io_list_sort()
+static void io_list_sort(void)
 {
     struct io_node *default_sink = NULL, *default_source = NULL;
     struct io_node *n, *temp;
@@ -365,7 +365,7 @@ static void io_list_sort()
     }
 }
 
-static void io_list_clear()
+static void io_list_clear(void)
 {
     struct io_node *n, *temp;
 
@@ -426,7 +426,7 @@ static void pending_list_remove(Uint32 id)
     }
 }
 
-static void pending_list_clear()
+static void pending_list_clear(void)
 {
     struct node_object *node, *temp;
 
@@ -751,7 +751,7 @@ static const struct pw_registry_events registry_events = { PW_VERSION_REGISTRY_E
                                                            .global_remove = registry_event_remove_callback };
 
 /* The hotplug thread */
-static int hotplug_loop_init()
+static int hotplug_loop_init(void)
 {
     int res;
 
@@ -794,7 +794,7 @@ static int hotplug_loop_init()
     return 0;
 }
 
-static void hotplug_loop_destroy()
+static void hotplug_loop_destroy(void)
 {
     if (hotplug_loop) {
         PIPEWIRE_pw_thread_loop_stop(hotplug_loop);
@@ -836,7 +836,7 @@ static void hotplug_loop_destroy()
     }
 }
 
-static void PIPEWIRE_DetectDevices()
+static void PIPEWIRE_DetectDevices(void)
 {
     struct io_node *io;
 
@@ -1342,7 +1342,7 @@ failed:
     return ret;
 }
 
-static void PIPEWIRE_Deinitialize()
+static void PIPEWIRE_Deinitialize(void)
 {
     if (pipewire_initialized) {
         hotplug_loop_destroy();

src/audio/pulseaudio/SDL_pulseaudio.c

@@ -885,7 +885,7 @@ static int SDLCALL HotplugThread(void *data)
     return 0;
 }
 
-static void PULSEAUDIO_DetectDevices()
+static void PULSEAUDIO_DetectDevices(void)
 {
     SDL_sem *ready_sem = SDL_CreateSemaphore(0);