remove deprecated conditional requirement function from resolvo.h

cpp/include/resolvo.h

@@ -24,15 +24,6 @@ inline Requirement requirement_union(VersionSetUnionId id) {
     return cbindgen_private::resolvo_requirement_union(id);
 }
 
-/**
- * Specifies a conditional requirement, where the requirement is only active when the condition is met.
- * @param condition The version set that must be satisfied for the requirement to be active.
- * @param requirement The version set that must be satisfied when the condition is met.
- */
-inline Requirement requirement_conditional(VersionSetId condition, VersionSetId requirement) {
-    return cbindgen_private::resolvo_requirement_conditional(condition, requirement);
-}
-
 /**
  * Called to solve a package problem.
  *