Fix c++20 (gcc-16/qt6.10)
See https://github.com/bibletime/bibletime/issues/539
and https://github.com/bibletime/bibletime/commit/13ed64c.patch
--- a/src/backend/keys/cswordtreekey.h
+++ b/src/backend/keys/cswordtreekey.h
@@ -50,11 +50,12 @@ class CSwordTreeKey final : public CSwordKey {
     public:
 
         #define BibleTime_CSwordTreeKey_DEFINE_COMP(op) \
-            friend bool operator op(CSwordTreeKey const & lhs, \
+            friend auto operator op(CSwordTreeKey const & lhs, \
                                     CSwordTreeKey const & rhs) \
             { return lhs.offset() op rhs.offset(); }
         #if __cpp_impl_three_way_comparison >= 201907L
         BibleTime_CSwordTreeKey_DEFINE_COMP(<=>)
+        BibleTime_CSwordTreeKey_DEFINE_COMP(==)
         #else
         BibleTime_CSwordTreeKey_DEFINE_COMP(<)
         BibleTime_CSwordTreeKey_DEFINE_COMP(<=)
--- a/src/backend/keys/cswordversekey.h
+++ b/src/backend/keys/cswordversekey.h
@@ -71,7 +71,7 @@ class CSwordVerseKey final : public CSwordKey {
     public: // methods:
 
         #define BibleTime_CSwordVerseKey_DEFINE_COMP(op) \
-            friend bool operator op(CSwordVerseKey const & lhs, \
+            friend auto operator op(CSwordVerseKey const & lhs, \
                                     CSwordVerseKey const & rhs) \
             { \
                 return std::tuple(lhs.testament(), lhs.book(), lhs.chapter(), \
@@ -81,6 +81,7 @@ class CSwordVerseKey final : public CSwordKey {
             }
         #if __cpp_impl_three_way_comparison >= 201907L
         BibleTime_CSwordVerseKey_DEFINE_COMP(<=>)
+        BibleTime_CSwordVerseKey_DEFINE_COMP(==)
         #else
         BibleTime_CSwordVerseKey_DEFINE_COMP(<)
         BibleTime_CSwordVerseKey_DEFINE_COMP(<=)