Add support to build and use SQLite amalgamation version on Windows. This change implements the same behavior as *nix build system does.
* build/generator/gen_win.py (parse_options): set self.sqlite_path to sqlite-amalgamation directory if --with-sqlite parameter not specified. (get_win_defines): Add SVN_SQLITE_INLINE define in SQLite amalgamation used. (get_win_includes,get_win_lib_dirs): Use headers and libraries from correct location if we're using SQLite amalgamation. (get_win_libs): Do not depend on sqlite3.lib if we're using SQLite amalgamation. (_find_sqlite): Try SQLite amalgamation if compiled SQLite not found in specified location. Error if SQLite version less than 3.4.0.