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/SDL_audioresample.c

@@ -453,7 +453,7 @@ static float Sinc(float *table, int x, int y)
 
 static Cubic ResamplerFilter[RESAMPLER_SAMPLES_PER_ZERO_CROSSING][RESAMPLER_SAMPLES_PER_FRAME];
 
-static void GenerateResamplerFilter()
+static void GenerateResamplerFilter(void)
 {
     enum
     {

src/audio/pipewire/SDL_pipewire.c

@@ -179,7 +179,7 @@ static int load_pipewire_syms(void)
     return 0;
 }
 
-static int init_pipewire_library()
+static int init_pipewire_library(void)
 {
     if (!load_pipewire_library()) {
         if (!load_pipewire_syms()) {