Upgrade SQLite from 3.16.2 to 3.35.3

Author: fiendish

sqlite3/readme.txt

@@ -21,7 +21,7 @@ BUILDING A NEW VERSION
 
 Sqlite3 built as follows:
 
-1. Download recent version from https://www.sqlite.org/2017/sqlite-amalgamation-3160200.zip
+1. Download new amalgamated source code from https://www.sqlite.org/download.html
 
 2. Unzip the file
 
@@ -35,7 +35,6 @@ sqlite3ext.h
 3. Edit: sqlite3.c and add the following lines to the start of it:
 
 // These first few lines added by NJG
-// version 3.16.2
 
 # pragma warning (disable : 4018)  // signed/unsigned mismatch
 # pragma warning (disable : 4022)  // pointer mismatch for actual parameter x