Clean up includes

src/blurhash.h

@@ -3,11 +3,7 @@
 
 #pragma once
 
-#include <math.h>
-#include <stdbool.h>
 #include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
 
 uint8_t *decode(const char *blurhash, int width, int height, int punch, int nChannels);