Remove redundant declaration.

Author: gregestren

src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java

@@ -1604,7 +1604,6 @@ public static final class Builder implements RuleErrorConsumer  {
     private final RuleErrorConsumer reporter;
     private OrderedSetMultimap<Attribute, ConfiguredTargetAndData> prerequisiteMap;
     private ConfigConditions configConditions;
-    private ImmutableMap<Label, ConfigMatchingProvider> configConditions = ImmutableMap.of();
     private NestedSet<PackageGroupContents> visibility;
     private ImmutableMap<String, Attribute> aspectAttributes;
     private ImmutableList<Aspect> aspects;