LogMatrix: fix the WASM build the right way (add missing include)

Author: axxel

core/src/LogMatrix.h

@@ -21,6 +21,7 @@
 
 #include <cassert>
 #include <cstdint>
+#include <cstdio>
 
 namespace ZXing {
 
@@ -42,7 +43,6 @@ class LogMatrix
 	void write(const char* fn)
 	{
 		assert(_image);
-#ifndef __EMSCRIPTEN_major__
 		FILE* f = fopen(fn, "wb");
 
 		// Write PPM header, P5 == grey, P6 == rgb
@@ -65,7 +65,6 @@ class LogMatrix
 				fwrite(&b, 1, 1, f);
 			}
 		fclose(f);
-#endif
 	}
 
 	template <typename T>