Suppresses erroneous Corrupt Jpeg messages sent from the jpeg library

Certain Foscam cameras and their clones stream jpeg images that appear fine visually but have some kind of minor issue that causes the jpeg library to continually report a warning.  

Prior to this patch, Zoneminder would fill the log with events like this:
zmc_m1 10017 WAR Corrupt JPEG data: 1 extraneous bytes before marker 0xd9 zm_jpeg.cpp 63

This patch suppresses these warnings