Switch use of valgrind away from --xml. XML forces leak-checking to be on, resulting in gigantic logs.  Also, I realized I don't need XML output now that I know how to use valgrind suppression files properly.
Switch use of valgrind away from --xml. XML forces leak-checking to be on, resulting in gigantic logs.  Also, I realized I don't need XML output now that I know how to use valgrind suppression files properly.

MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz