Move a special case for PIC from the genex to the cmTarget code.

Source/cmGeneratorExpressionEvaluator.cxx

@@ -460,12 +460,6 @@ static const struct TargetPropertyNode : public cmGeneratorExpressionNode
         {
         return std::string();
         }
-      if (propertyName == "POSITION_INDEPENDENT_CODE")
-        {
-        context->HadContextSensitiveCondition = true;
-        return target->GetLinkInterfaceDependentBoolProperty(
-                    "POSITION_INDEPENDENT_CODE", context->Config) ? "1" : "0";
-        }
       if (target->IsLinkInterfaceDependentBoolProperty(propertyName,
                                                        context->Config))
         {

Source/cmTarget.cxx

@@ -4797,7 +4797,8 @@ bool isLinkDependentProperty(cmTarget *tgt, const std::string &p,
 bool cmTarget::IsLinkInterfaceDependentBoolProperty(const std::string &p,
                                            const char *config)
 {
-  return isLinkDependentProperty(this, p, "COMPATIBLE_INTERFACE_BOOL",
+  return (p == "POSITION_INDEPENDENT_CODE") ||
+    isLinkDependentProperty(this, p, "COMPATIBLE_INTERFACE_BOOL",
                                  config);
 }