Remove obsolete owner pays fee feature and XRPL_ABANDON stanza (#5550)

If a feature was never voted on then it is safe to remove.

src/libxrpl/protocol/Feature.cpp

@@ -254,7 +254,7 @@ FeatureCollections::registerFeature(
 {
     check(!readOnly, "Attempting to register a feature after startup.");
     check(
-        support == Supported::yes || vote != VoteBehavior::DefaultYes,
+        support == Supported::yes || vote == VoteBehavior::DefaultNo,
         "Invalid feature parameters. Must be supported to be up-voted.");
     Feature const* i = getByName(name);
     if (!i)
@@ -268,7 +268,7 @@ FeatureCollections::registerFeature(
         features.emplace_back(name, f);
 
         auto const getAmendmentSupport = [=]() {
-            if (vote == VoteBehavior::Obsolete && support == Supported::yes)
+            if (vote == VoteBehavior::Obsolete)
                 return AmendmentSupport::Retired;
             return support == Supported::yes ? AmendmentSupport::Supported
                                              : AmendmentSupport::Unsupported;
@@ -398,14 +398,6 @@ retireFeature(std::string const& name)
     return registerFeature(name, Supported::yes, VoteBehavior::Obsolete);
 }
 
-// Abandoned features are not in the ledger and have no code controlled by the
-// feature. They were never supported, and cannot be voted on.
-uint256
-abandonFeature(std::string const& name)
-{
-    return registerFeature(name, Supported::no, VoteBehavior::Obsolete);
-}
-
 /** Tell FeatureCollections when registration is complete. */
 bool
 registrationIsDone()
@@ -440,8 +432,6 @@ featureToName(uint256 const& f)
 #undef XRPL_FIX
 #pragma push_macro("XRPL_RETIRE")
 #undef XRPL_RETIRE
-#pragma push_macro("XRPL_ABANDON")
-#undef XRPL_ABANDON
 
 #define XRPL_FEATURE(name, supported, vote) \
     uint256 const feature##name = registerFeature(#name, supported, vote);
@@ -453,11 +443,6 @@ featureToName(uint256 const& f)
     [[deprecated("The referenced amendment has been retired")]] \
     [[maybe_unused]]                                            \
     uint256 const retired##name = retireFeature(#name);
-
-#define XRPL_ABANDON(name)                                        \
-    [[deprecated("The referenced amendment has been abandoned")]] \
-    [[maybe_unused]]                                              \
-    uint256 const abandoned##name = abandonFeature(#name);
 // clang-format on
 
 #include <xrpl/protocol/detail/features.macro>
@@ -468,8 +453,6 @@ featureToName(uint256 const& f)
 #pragma pop_macro("XRPL_FIX")
 #undef XRPL_FEATURE
 #pragma pop_macro("XRPL_FEATURE")
-#undef XRPL_ABANDON
-#pragma pop_macro("XRPL_ABANDON")
 
 // All of the features should now be registered, since variables in a cpp file
 // are initialized from top to bottom.