Added a totally un-optimized SQLite 3.8.3.1 version

Compiled with: ./emcc  -g0 -DSQLITE_THREADSAFE=0
-DSQLITE_OMIT_LOAD_EXTENSION -O2 -s ASM_JS=0 -s
ALIASING_FUNCTION_POINTERS=0 -s EXPORTED_FUNCTIONS="['_sqlite3_open',
'_sqlite3_exec']" sqlite3.c

@kripken, I'd much appreciate it if I can have the best compiled option you've used to build 3.7 version.