Close file pointer after adding to archive

When adding files to an archive, the file pointer was being left open.
This was preventing adding large numbers of files to an archive.

ZipArchive/Main.m

@@ -628,6 +628,8 @@
     
     zipCloseFileInZip(_zip);
     free(buffer);
+    
+    fclose(input);
 
     return YES;
 }