[sql] Enable disabled clang warnings.

third_party/sqlite/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 config("sqlite_config") {
   include_dirs = [ "." ]
 }
 
 source_set("sqlite") {
   sources = [
@@ skipping 70 matching lines @@
   } else if (is_android) {
     defines += [
       "SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT=1048576",
       "SQLITE_DEFAULT_AUTOVACUUM=1",
       "SQLITE_TEMP_STORE=3",
       "SQLITE_ENABLE_FTS3_BACKWARDS",
       "DSQLITE_DEFAULT_FILE_FORMAT=4",
     ]
   }
 
-  if (is_clang) {
-    cflags += [
-      # sqlite does `if (*a++ && *b++);` in a non-buggy way.
-      "-Wno-empty-body",
-
-      # sqlite has some `unsigned < 0` checks.
-      "-Wno-tautological-compare",
-
-      # Needed because we don't have this commit yet:
-      # https://github.com/mackyle/sqlite/commit/25df0fa050dcc9be7fb937b8e25be24049b3fef0
-      "-Wno-pointer-bool-conversion",
-    ]
-  }
-
   public_configs = [ ":sqlite_config" ]
 
   deps = [
     "//third_party/icu",
   ]
 }
 
 if (is_linux) {
   executable("sqlite_shell") {
     sources = [
@@ skipping 14 matching lines @@
 if (is_ios) {
   source_set("sqlite_regexp") {
     sources = [
       "src/ext/icu/icu.c",
     ]
     deps = [
       "//third_party/icu",
     ]
   }
 }