Install bitcoin-wallet manpage.
Install bitcoin-wallet manpage.

This change marks the already-existing bitcoin-wallet.1 manpage file for
installation together with the others.  Previously, only bitcoind.1,
bitcoin-cli.1, bitcoin-tx.1 and bitcoin-qt.1 would be installed.

Github-Pull: #15947
Rebased-From: 00d110463aed12ecdc6e9c2bf47d9ef61d19fa9d

untrustbank/litecoin,GroestlCoin/GroestlCoin,qtumproject/qtum,GroestlCoin/GroestlCoin,GroestlCoin/GroestlCoin,bespike/litecoin,vertcoin/vertcoin,bespike/litecoin,bespike/litecoin,GroestlCoin/bitcoin,ahmedbodi/vertcoin,vertcoin/vertcoin,ahmedbodi/vertcoin,vertcoin/vertcoin,untrustbank/litecoin,myriadteam/myriadcoin,qtumproject/qtum,qtumproject/qtum,qtumproject/qtum,untrustbank/litecoin,GroestlCoin/bitcoin,bespike/litecoin,ahmedbodi/vertcoin,GroestlCoin/bitcoin,myriadcoin/myriadcoin,vertcoin/vertcoin,myriadteam/myriadcoin,untrustbank/litecoin,untrustbank/litecoin,myriadteam/myriadcoin,myriadcoin/myriadcoin,myriadteam/myriadcoin,myriadteam/myriadcoin,myriadcoin/myriadcoin,myriadcoin/myriadcoin,vertcoin/vertcoin,GroestlCoin/GroestlCoin,bespike/litecoin,GroestlCoin/bitcoin,qtumproject/qtum,GroestlCoin/GroestlCoin,untrustbank/litecoin,ahmedbodi/vertcoin,ahmedbodi/vertcoin,myriadcoin/myriadcoin,GroestlCoin/GroestlCoin,myriadcoin/myriadcoin,ahmedbodi/vertcoin,qtumproject/qtum,GroestlCoin/bitcoin,myriadteam/myriadcoin,qtumproject/qtum,GroestlCoin/bitcoin,bespike/litecoin,vertcoin/vertcoin