re-introduce old nss im too tired for this

security/nss/coreconf/sanitizers.sh

@@ -42,18 +42,13 @@ enable_sancov()
     enable_sanitizer sancov "$sancov"
 }
 
-enable_sourcecov()
-{
-    enable_sanitizer sourcecov
-}
-
 enable_ubsan()
 {
     local ubsan
     if [ -n "$1" ]; then
         ubsan="$1"
     else
-        ubsan=undefined,local-bounds
+        ubsan=bool,signed-integer-overflow,shift,vptr
     fi
     enable_sanitizer ubsan "$ubsan"
 }