Use -Werror in external/sqlite/dist

* Keep existing warning of unused function/parameter.
external/sqlite/dist/shell.c:4386:7: warning: unused parameter 'nVal' [-Wunused-parameter]
external/sqlite/dist/sqlite3.c:155154:20: warning: unused function 'sqlite3Fts3InitHashTable' [-Wunused-function]

Bug: 66996870
Test: build with WITH_TIDY=1
Merged-In: I649eecd3948fbe49bb153b14a8eae9b110a79734
Change-Id: I58f9a98f9244760a85735056e8e7276be9099e3f