Changes for sndlib_support_1_1 ... forgot this one when tagging the others. Fixes use of sflseek, which assumes a fixed header size.
Changes for sndlib_support_1_1 ... forgot this one when tagging the others.
Fixes use of sflseek, which assumes a fixed header size.

RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix