Drop unused reverselock.h

Author: ajtowns

src/Makefile.am

@@ -178,7 +178,6 @@ BITCOIN_CORE_H = \
   random.h \
   randomenv.h \
   reverse_iterator.h \
-  reverselock.h \
   rpc/blockchain.h \
   rpc/client.h \
   rpc/protocol.h \