build: require sqlite when building the wallet

Require that sqlite is available in order to compile the wallet. Removes
instances of USE_SQLITE since it is no longer possible to not have
sqlite available.

The NO_SQLITE option is dropped from depends.

Co-authored-by: Ava Chow <github@achow101.com>
Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>

doc/build-freebsd.md

@@ -42,7 +42,7 @@ from ports. However, you can build DB 4.8 yourself [using depends](/depends).
 
 ```bash
 pkg install gmake
-gmake -C depends NO_BOOST=1 NO_LIBEVENT=1 NO_QT=1 NO_SQLITE=1 NO_ZMQ=1 NO_USDT=1
+gmake -C depends NO_BOOST=1 NO_LIBEVENT=1 NO_QT=1 NO_ZMQ=1 NO_USDT=1
 ```
 
 When the build is complete, the Berkeley DB installation location will be displayed: