Clang: Cleanup string interface of sqlite

We only will need the utf8 optimized SmallString for the indexer database.
So we remove all other string bindings, QByteArray and QVariant.

Change-Id: I4a77901a80b26bf292fc85df535c2ccf3a8ab52f
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/sqlitereadstatement.cpp

@@ -29,9 +29,9 @@
 
 namespace Sqlite {
 
-SqliteReadStatement::SqliteReadStatement(const Utf8String &sqlStatementUtf8,
+SqliteReadStatement::SqliteReadStatement(Utils::SmallStringView sqlStatement,
                                          SqliteDatabase &database)
-    : SqliteStatement(sqlStatementUtf8, database)
+    : SqliteStatement(sqlStatement, database)
 {
     checkIsReadOnlyStatement();
 }