code: private String addVersionQualifierToQualifiers(String qualifiers) {
          int versionQualifierApiLevel = ResBundle.getVersionQualifierApiLevel(qualifiers);
          if (versionQualifierApiLevel == -1) {
              if (qualifiers.length() > 0) {
                  qualifiers += "-";
              }
              qualifiers += "v" + sdkConfig.getApiLevel();
          }
          return qualifiers;
      }
docs: /*
  If the Config already has a version qualifier, do nothing. Otherwise, add a version
  qualifier for the target api level (which comes from the manifest or Config.emulateSdk()).