Notwithstanding the provisions of § 6, Article VII, Constitution of the State of Texas, any county, acting through the commissioners court, may reduce the county permanent school fund of that county and may distribute the amount of the reduction to the independent and common school districts of the county on a per scholastic basis to be used solely for the purpose of reducing bonded indebtedness of those districts or for making permanent improvements. The commissioners court shall, however, retain a sufficient amount of the corpus of the county permanent school fund to pay ad valorem taxes on school lands or royalty interests owned at the time of the distribution. Nothing in this Section affects financial aid to any school district by the state.