Allowed this project to compile on Windows.

I was missing a c file for windows-specific builds.

player/src/main/c/player_win.c

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+#include <jni.h>
+#include <stdio.h>
+
+int updatePlayer(JNIEnv *env, jobject obj, jobject stream, jshort numChannels, jshort bitsPerSample, jint sampleRate)
+{
+    printf("Updating File\n");
+    return 0;
+}