Activate SQLITE_OPEN_EXRESCODE by default

I am not completly sure that it is fine to activate this flag with an old
SQLite version.
See http://sqlite.org/c3ref/open.html
> If the 3rd parameter to sqlite3_open_v2() is not one of the required combinations shown above optionally combined with other SQLITE_OPEN_* bits then the behavior is undefined.

src/inner_connection.rs

@@ -12,6 +12,7 @@ use super::{Connection, InterruptHandle, OpenFlags, PrepFlags, Result};
 use crate::error::{error_from_handle, error_from_sqlite_code, error_with_offset, Error};
 use crate::raw_statement::RawStatement;
 use crate::statement::Statement;
+use crate::version_number;
 
 pub struct InnerConnection {
     pub db: *mut ffi::sqlite3,
@@ -99,7 +100,9 @@ impl InnerConnection {
             }
 
             // attempt to turn on extended results code; don't fail if we can't.
-            ffi::sqlite3_extended_result_codes(db, 1);
+            if version_number() < 3_037_000 || !flags.contains(OpenFlags::SQLITE_OPEN_EXRESCODE) {
+                ffi::sqlite3_extended_result_codes(db, 1);
+            }
 
             let r = ffi::sqlite3_busy_timeout(db, 5000);
             if r != ffi::SQLITE_OK {
@@ -210,7 +213,6 @@ impl InnerConnection {
         let mut c_stmt: *mut ffi::sqlite3_stmt = ptr::null_mut();
         let (c_sql, len, _) = str_for_sqlite(sql.as_bytes())?;
         let mut c_tail: *const c_char = ptr::null();
-        // TODO sqlite3_prepare_v3 (https://sqlite.org/c3ref/c_prepare_normalize.html) // 3.20.0, #728
         #[cfg(not(feature = "unlock_notify"))]
         let r = unsafe { self.prepare_(c_sql, len, flags, &mut c_stmt, &mut c_tail) };
         #[cfg(feature = "unlock_notify")]

src/lib.rs

@@ -1214,6 +1214,7 @@ impl Default for OpenFlags {
             | OpenFlags::SQLITE_OPEN_CREATE
             | OpenFlags::SQLITE_OPEN_NO_MUTEX
             | OpenFlags::SQLITE_OPEN_URI
+            | OpenFlags::SQLITE_OPEN_EXRESCODE
     }
 }