upgrade modernc.org/sqlite to v1.31.0

[oldyoghourt]

support build on windows 386

[xiaozuo7]

+1 need build on windows 386 too

$ GOARCH=386 go build -ldflags="-w -s" -o xx_i386.exe

modernc.org/sqlite/lib

C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\defs.go:13:35: undefined: sqlite3_index_constraint
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\defs.go:14:35: undefined: sqlite3_index_orderby
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\defs.go:15:35: undefined: sqlite3_index_constraint_usage
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:19:5: undefined: Xsqlite3_threadsafe
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:29:11: undefined: Xsqlite3_config
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:29:32: undefined: SQLITE_CONFIG_MUTEX
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:29:122: undefined: SQLITE_OK
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:30:8: undefined: Xsqlite3_errstr
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:40:17: undefined: Sqlite3_mutex_methods
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:239:46: undefined: SQLITE_OK
C:\Users\Administrator\go\pkg\mod\modernc.org\sqlite@v1.28.0\lib\mutex.go:239:46: too many errors