net-snmp: add ac_cv_header_valgrind_* to CACHED_CONFIGUREVARS
net-snmp: add ac_cv_header_valgrind_* to CACHED_CONFIGUREVARS

There have been occasions that net-snmp sees valgrind and then later it's
not available, adding this setting ensures determinism by disabling it by
default

Signed-off-by: Jackie Huang <49ec7cfe045884df7178a7e982697c7043dbc82b@windriver.com>
Signed-off-by: Joe MacDonald <fbe30f12b401d02c5cf3f5c053fced92c546e3de@mentor.com>

WindRiver-OpenSourceLabs/meta-networking