scripted-diff: Replace CCriticalSection with RecursiveMutex

-BEGIN VERIFY SCRIPT-
 # Delete outdated alias for RecursiveMutex
 sed -i -e '/CCriticalSection/d'                 ./src/sync.h
 # Replace use of outdated alias with RecursiveMutex
 sed -i -e 's/CCriticalSection/RecursiveMutex/g' $(git grep -l CCriticalSection)
-END VERIFY SCRIPT-

src/validation.cpp

@@ -133,7 +133,7 @@ CTxMemPool mempool(&feeEstimator);
 namespace {
     CBlockIndex* pindexBestInvalid = nullptr;
 
-    CCriticalSection cs_LastBlockFile;
+    RecursiveMutex cs_LastBlockFile;
     std::vector<CBlockFileInfo> vinfoBlockFile;
     int nLastBlockFile = 0;
     /** Global flag to indicate we should check to see if there are