Dummy VGM 1.5 Header for YM2612 and SN76489 Data

A version 1.5 VGM heading, with impossible values for [EoF offset] and [Total # samples] fields. A file where the data is intact but the header is clearly a dummy header (such as this one) still works fine - at least in Audio Overload. The header is as follows, and terminates at 0x3F.

56 67 6D 20 00 00 00 00 50 01 00 00 99 9E 36 00 00 00 00 00 00 00 00 00 FF FF FF FF 00 00 00 00 00 00 00 00 3C 00 00 00 09 00 10 00 B5 0A 75 00 00 00 00 00 0C 00 00 00 00 00 00 00 00 00 00 00