Add sqlite_dbpage extension build tag

Author: hifi

README.md

@@ -180,6 +180,7 @@ go build -tags "icu json1 fts5 secure_delete"
 | Tracing / Debug | sqlite_trace | Activate trace functions |
 | User Authentication | sqlite_userauth | SQLite User Authentication see [User Authentication](#user-authentication) for more information. |
 | Virtual Tables | sqlite_vtable | SQLite Virtual Tables see [SQLite Official VTABLE Documentation](https://www.sqlite.org/vtab.html) for more information, and a [full example here](https://github.com/mattn/go-sqlite3/tree/master/_example/vtable) |
+| SQLITE_DBPAGE Virtual Table | sqlite_dbpage | SQLITE_DBPAGE Virtual Table see [SQLite Official SQLITE_DBPAGE Documentation](https://www.sqlite.org/dbpage.html) for more information. |
 
 # Compilation
 

sqlite3_opt_dbpage.go

@@ -0,0 +1,15 @@
+// Copyright (C) 2019 Yasuhiro Matsumoto <[email protected]>.
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build sqlite_dbpage
+// +build sqlite_dbpage
+
+package sqlite3
+
+/*
+#cgo CFLAGS: -DSQLITE_ENABLE_DBPAGE_VTAB
+#cgo LDFLAGS: -lm
+*/
+import "C"