Tune SQLite build for redbean (#97)

redbean lua handlers that perform sql queries can do 400k qps.

We now use a separate compile-time options for SQLite, when building the
SQLite shell versus building the production web serving code. It doesn't
seem appropriate for something like redbean to include backups, progress
callbacks, query completion, profiling, EXPLAIN, ALTER, ANALYZE, VACUUM,
etc. since those tasks are better left to the sqlite3.com shell program.

Lua SQLite pointer APIs have been removed since we're not using threads.
The Lua APIs for installing update / commit / rollback hooks are removed
due to a general sense of disagreement and an overall lack of comfort.

Full-Text Search and R*Tree are as large as the rest of SQLite combined.
Turning those off keeps redbean under 1mb when built for MODE=tiny which
is nice for marketing purposes.

If you need something that was removed, file an issue, and we'll add it.

libc/str/strncasecmp16.c

@@ -30,6 +30,6 @@ int strncasecmp16(const char16_t *a, const char16_t *b, size_t n) {
   int x, y;
   size_t i = 0;
   if (!n-- || a == b) return 0;
-  while ((x = tolower(a[i])) == (y = tolower(b[i])) && b[i] && i < n) ++i;
+  while ((x = towlower(a[i])) == (y = towlower(b[i])) && b[i] && i < n) ++i;
   return x - y;
 }

third_party/sqlite3/expr.c

@@ -524,7 +524,9 @@ Expr *sqlite3ExprForVectorField(
   }else{
     if( pVector->op==TK_VECTOR ) pVector = pVector->x.pList->a[iField].pExpr;
     pRet = sqlite3ExprDup(pParse->db, pVector, 0);
+#ifndef SQLITE_OMIT_ALTERTABLE
     sqlite3RenameTokenRemap(pParse, pRet, pVector);
+#endif
   }
   return pRet;
 }