try to fix compilation with HAVE_NORM
try to fix compilation with HAVE_NORM

Revert "Silence some warnings" for vvmulticast.h
This partially reverts commit aad865504004f2bc103903c4ec84ce401966193c.

deskvox/deskvox,deskvox/deskvox,deskvox/deskvox,deskvox/deskvox,deskvox/deskvox