Enable sqlite_stat4.

sqlite3/sqlite_cfg.h

@@ -18,6 +18,8 @@
 #define HAVE_STDINT_H 1
 #define HAVE_INTTYPES_H 1
 
+#define LONGDOUBLE_TYPE double
+
 #define HAVE_LOG2 1
 #define HAVE_LOG10 1
 #define HAVE_ISNAN 1

sqlite3/sqlite_opt.h

@@ -23,6 +23,7 @@
 #define SQLITE_DEFAULT_FOREIGN_KEYS 1
 #define SQLITE_ENABLE_ATOMIC_WRITE
 #define SQLITE_ENABLE_BATCH_ATOMIC_WRITE
+#define SQLITE_ENABLE_STAT4 1
 
 // We have our own memdb VFS.
 // To avoid interactions between the two,