Resolve a parallel build timing issue when building sqlite3.c/h from ext/wasm. For...

Resolve a parallel build timing issue when building sqlite3.c/h from ext/wasm. For the time being, do not add sqlite3_wasm_extra_init.c to fiddle.wasm because it can cause duplicate definitions of extensions which are already built into the shell (a better resolution for this conflict is pending). No longer add sqlite3_wasm_extra_init.c to speedtest1.wasm because it's useless there.

FossilOrigin-Name: 75fdd5b83b4c527d25649b0d08841e3dc7d4d8109c1c97b2195b303538ced73d