Qt4: Fix GCC compile warnings
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Qt4: Fix GCC compile warnings

* qt4/qsecurelineedit.cpp (QSecureLineEdit::sizeHint),
(QSecureLineEdit::minimumSizeHint): Remove unused Q_D macros.
(QSecureLineEdit::setCursorPosition, QSecureLineEditPrivate::setText),
(QSecureLineEditPrivate::hasAcceptableInput): Explicitly cast length to int.
(QSecureLineEditPrivate::maskString): Use unsigned type for strIndex.
(QSecureLineEditPrivate::maskString): Remove uneccesary casts.
* qt4/secstring.cpp (toUtf8): Remove unused variable.