add: UNITY_WEBGL predefined for webgl build #10

Author: netpyoung

unity_project/Assets/unity.webp/Runtime/NativeLibwebp.cs

@@ -16,6 +16,8 @@ public static unsafe partial class NativeLibwebp
 		const string DLL_NAME = "webp";
 #elif UNITY_IOS
 		const string DLL_NAME = "__Internal";
+#elif UNITY_WEBGL
+        const string DLL_NAME = "__Internal";
 #endif
         [DllImport(DLL_NAME, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
         public static extern int WebPGetDecoderVersion();

unity_project/Assets/unity.webp/Runtime/NativeLibwebpdemux.cs

@@ -16,6 +16,8 @@ public static unsafe partial class NativeLibwebpdemux
 		const string DLL_NAME = "webpdemux";
 #elif UNITY_IOS
 		const string DLL_NAME = "__Internal";
+#elif UNITY_WEBGL
+		const string DLL_NAME = "__Internal";
 #endif
 
         [DllImport(DLL_NAME, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]